From c817a67ecba7c3c2aaa104796d78f160af60920d Mon Sep 17 00:00:00 2001 From: Russell King Date: Thu, 27 Jun 2013 15:06:14 +0100 Subject: kobject: delayed kobject release: help find buggy drivers Implement debugging for kobject release functions. kobjects are reference counted, so the drop of the last reference to them is not predictable. However, the common case is for the last reference to be the kobject's removal from a subsystem, which results in the release function being immediately called. This can hide subtle bugs, which can occur when another thread holds a reference to the kobject at the same time that a kobject is removed. This results in the release method being delayed. In order to make these kinds of problems more visible, the following patch implements a delayed release; this has the effect that the release function will be out of order with respect to the removal of the kobject in the same manner that it would be if a reference was being held. This provides us with an easy way to allow driver writers to debug their drivers and fix otherwise hidden problems. Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- include/linux/kobject.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/kobject.h b/include/linux/kobject.h index 939b11268c86..de6dcbcc6ef7 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -26,6 +26,7 @@ #include #include #include +#include #define UEVENT_HELPER_PATH_LEN 256 #define UEVENT_NUM_ENVP 32 /* number of env pointers */ @@ -65,6 +66,9 @@ struct kobject { struct kobj_type *ktype; struct sysfs_dirent *sd; struct kref kref; +#ifdef CONFIG_DEBUG_KOBJECT_RELEASE + struct delayed_work release; +#endif unsigned int state_initialized:1; unsigned int state_in_sysfs:1; unsigned int state_add_uevent_sent:1; -- cgit v1.2.3 From fa6fdb33b486a8afc5439c504da8d581e142c77d Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 8 Aug 2013 15:22:55 -0700 Subject: driver core: bus_type: add dev_groups attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add dev_groups to struct bus_type which should be used instead of dev_attrs. dev_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman --- drivers/base/base.h | 5 +++++ drivers/base/bus.c | 6 ++++++ drivers/base/core.c | 7 +++---- include/linux/device.h | 4 +++- 4 files changed, 17 insertions(+), 5 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/base.h b/drivers/base/base.h index b8bdfe61daa6..fccf954f82fd 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -119,6 +119,11 @@ static inline int driver_match_device(struct device_driver *drv, return drv->bus->match ? drv->bus->match(dev, drv) : 1; } +extern int device_add_groups(struct device *dev, + const struct attribute_group **groups); +extern void device_remove_groups(struct device *dev, + const struct attribute_group **groups); + extern char *make_class_name(const char *name, struct kobject *kobj); extern int devres_release_all(struct device *dev); diff --git a/drivers/base/bus.c b/drivers/base/bus.c index d414331b480e..7b2dc5ba7d79 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -499,6 +499,9 @@ int bus_add_device(struct device *dev) error = device_add_attrs(bus, dev); if (error) goto out_put; + error = device_add_groups(dev, bus->dev_groups); + if (error) + goto out_groups; error = sysfs_create_link(&bus->p->devices_kset->kobj, &dev->kobj, dev_name(dev)); if (error) @@ -513,6 +516,8 @@ int bus_add_device(struct device *dev) out_subsys: sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev)); +out_groups: + device_remove_groups(dev, bus->dev_groups); out_id: device_remove_attrs(bus, dev); out_put: @@ -575,6 +580,7 @@ void bus_remove_device(struct device *dev) sysfs_remove_link(&dev->bus->p->devices_kset->kobj, dev_name(dev)); device_remove_attrs(dev->bus, dev); + device_remove_groups(dev, dev->bus->dev_groups); if (klist_node_attached(&dev->p->knode_bus)) klist_del(&dev->p->knode_bus); diff --git a/drivers/base/core.c b/drivers/base/core.c index e51c78782933..09a99d609644 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -491,8 +491,7 @@ static void device_remove_bin_attributes(struct device *dev, device_remove_bin_file(dev, &attrs[i]); } -static int device_add_groups(struct device *dev, - const struct attribute_group **groups) +int device_add_groups(struct device *dev, const struct attribute_group **groups) { int error = 0; int i; @@ -511,8 +510,8 @@ static int device_add_groups(struct device *dev, return error; } -static void device_remove_groups(struct device *dev, - const struct attribute_group **groups) +void device_remove_groups(struct device *dev, + const struct attribute_group **groups) { int i; diff --git a/include/linux/device.h b/include/linux/device.h index 22b546a58591..3aec4a68b1d4 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -66,6 +66,7 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *); * @bus_attrs: Default attributes of the bus. * @dev_attrs: Default attributes of the devices on the bus. * @drv_attrs: Default attributes of the device drivers on the bus. + * @dev_groups: Default attributes of the devices on the bus. * @match: Called, perhaps multiple times, whenever a new device or driver * is added for this bus. It should return a nonzero value if the * given device can be handled by the given driver. @@ -104,8 +105,9 @@ struct bus_type { const char *dev_name; struct device *dev_root; struct bus_attribute *bus_attrs; - struct device_attribute *dev_attrs; + struct device_attribute *dev_attrs; /* use dev_groups instead */ struct driver_attribute *drv_attrs; + const struct attribute_group **dev_groups; int (*match)(struct device *dev, struct device_driver *drv); int (*uevent)(struct device *dev, struct kobj_uevent_env *env); -- cgit v1.2.3 From ed0617b5c0bcd7fd04053568aa0cc19a977a1f26 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 8 Aug 2013 15:22:56 -0700 Subject: driver core: bus_type: add drv_groups attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add drv_groups to struct bus_type which should be used instead of drv_attrs. drv_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman --- drivers/base/base.h | 5 +++++ drivers/base/bus.c | 5 +++++ drivers/base/driver.c | 8 ++++---- include/linux/device.h | 4 +++- 4 files changed, 17 insertions(+), 5 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/base.h b/drivers/base/base.h index fccf954f82fd..2cbc6774f4cd 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -119,6 +119,11 @@ static inline int driver_match_device(struct device_driver *drv, return drv->bus->match ? drv->bus->match(dev, drv) : 1; } +extern int driver_add_groups(struct device_driver *drv, + const struct attribute_group **groups); +extern void driver_remove_groups(struct device_driver *drv, + const struct attribute_group **groups); + extern int device_add_groups(struct device *dev, const struct attribute_group **groups); extern void device_remove_groups(struct device *dev, diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 7b2dc5ba7d79..de5ce22df306 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -725,6 +725,10 @@ int bus_add_driver(struct device_driver *drv) printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n", __func__, drv->name); } + error = driver_add_groups(drv, bus->drv_groups); + if (error) + printk(KERN_ERR "%s: driver_create_groups(%s) failed\n", + __func__, drv->name); if (!drv->suppress_bind_attrs) { error = add_bind_files(drv); @@ -762,6 +766,7 @@ void bus_remove_driver(struct device_driver *drv) if (!drv->suppress_bind_attrs) remove_bind_files(drv); driver_remove_attrs(drv->bus, drv); + driver_remove_groups(drv, drv->bus->drv_groups); driver_remove_file(drv, &driver_attr_uevent); klist_remove(&drv->p->knode_bus); pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name); diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 974e301a1ef0..89db726ebb98 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -123,8 +123,8 @@ void driver_remove_file(struct device_driver *drv, } EXPORT_SYMBOL_GPL(driver_remove_file); -static int driver_add_groups(struct device_driver *drv, - const struct attribute_group **groups) +int driver_add_groups(struct device_driver *drv, + const struct attribute_group **groups) { int error = 0; int i; @@ -143,8 +143,8 @@ static int driver_add_groups(struct device_driver *drv, return error; } -static void driver_remove_groups(struct device_driver *drv, - const struct attribute_group **groups) +void driver_remove_groups(struct device_driver *drv, + const struct attribute_group **groups) { int i; diff --git a/include/linux/device.h b/include/linux/device.h index 3aec4a68b1d4..94d987f128bb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -67,6 +67,7 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *); * @dev_attrs: Default attributes of the devices on the bus. * @drv_attrs: Default attributes of the device drivers on the bus. * @dev_groups: Default attributes of the devices on the bus. + * @drv_groups: Default attributes of the device drivers on the bus. * @match: Called, perhaps multiple times, whenever a new device or driver * is added for this bus. It should return a nonzero value if the * given device can be handled by the given driver. @@ -106,8 +107,9 @@ struct bus_type { struct device *dev_root; struct bus_attribute *bus_attrs; struct device_attribute *dev_attrs; /* use dev_groups instead */ - struct driver_attribute *drv_attrs; + struct driver_attribute *drv_attrs; /* use drv_groups instead */ const struct attribute_group **dev_groups; + const struct attribute_group **drv_groups; int (*match)(struct device *dev, struct device_driver *drv); int (*uevent)(struct device *dev, struct kobj_uevent_env *env); -- cgit v1.2.3 From 12478ba077adf8b53be6101b80dd8a65e4df9ea6 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 8 Aug 2013 15:22:57 -0700 Subject: driver core: bus_type: add bus_groups attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add bus_groups to struct bus_type which should be used instead of bus_attrs. bus_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman --- drivers/base/bus.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/device.h | 4 +++- 2 files changed, 40 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/drivers/base/bus.c b/drivers/base/bus.c index de5ce22df306..5ee5d3c1d74b 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -881,6 +881,37 @@ static void bus_remove_attrs(struct bus_type *bus) } } +static int bus_add_groups(struct bus_type *bus, + const struct attribute_group **groups) +{ + int error = 0; + int i; + + if (groups) { + for (i = 0; groups[i]; i++) { + error = sysfs_create_group(&bus->p->subsys.kobj, + groups[i]); + if (error) { + while (--i >= 0) + sysfs_remove_group(&bus->p->subsys.kobj, + groups[i]); + break; + } + } + } + return error; +} + +static void bus_remove_groups(struct bus_type *bus, + const struct attribute_group **groups) +{ + int i; + + if (groups) + for (i = 0; groups[i]; i++) + sysfs_remove_group(&bus->p->subsys.kobj, groups[i]); +} + static void klist_devices_get(struct klist_node *n) { struct device_private *dev_prv = to_device_private_bus(n); @@ -973,10 +1004,15 @@ int bus_register(struct bus_type *bus) retval = bus_add_attrs(bus); if (retval) goto bus_attrs_fail; + retval = bus_add_groups(bus, bus->bus_groups); + if (retval) + goto bus_groups_fail; pr_debug("bus: '%s': registered\n", bus->name); return 0; +bus_groups_fail: + bus_remove_attrs(bus); bus_attrs_fail: remove_probe_files(bus); bus_probe_files_fail: @@ -1007,6 +1043,7 @@ void bus_unregister(struct bus_type *bus) if (bus->dev_root) device_unregister(bus->dev_root); bus_remove_attrs(bus); + bus_remove_groups(bus, bus->bus_groups); remove_probe_files(bus); kset_unregister(bus->p->drivers_kset); kset_unregister(bus->p->devices_kset); diff --git a/include/linux/device.h b/include/linux/device.h index 94d987f128bb..26e23b22ed0a 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -66,6 +66,7 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *); * @bus_attrs: Default attributes of the bus. * @dev_attrs: Default attributes of the devices on the bus. * @drv_attrs: Default attributes of the device drivers on the bus. + * @bus_groups: Default attributes of the bus. * @dev_groups: Default attributes of the devices on the bus. * @drv_groups: Default attributes of the device drivers on the bus. * @match: Called, perhaps multiple times, whenever a new device or driver @@ -105,9 +106,10 @@ struct bus_type { const char *name; const char *dev_name; struct device *dev_root; - struct bus_attribute *bus_attrs; + struct bus_attribute *bus_attrs; /* use bus_groups instead */ struct device_attribute *dev_attrs; /* use dev_groups instead */ struct driver_attribute *drv_attrs; /* use drv_groups instead */ + const struct attribute_group **bus_groups; const struct attribute_group **dev_groups; const struct attribute_group **drv_groups; -- cgit v1.2.3 From bd0eae4e1cd5c4ff7c2a9ebcb3e78ea4631251ef Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 24 Jul 2013 15:05:19 -0700 Subject: PPS: convert class code to use dev_groups The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the pps class code to use the correct field. Cc: Rodolfo Giometti Signed-off-by: Greg Kroah-Hartman --- drivers/pps/pps.c | 2 +- drivers/pps/sysfs.c | 55 +++++++++++++++++++++++++++++----------------- include/linux/pps_kernel.h | 2 +- 3 files changed, 37 insertions(+), 22 deletions(-) (limited to 'include/linux') diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c index 7173e3ad475d..2f07cd615665 100644 --- a/drivers/pps/pps.c +++ b/drivers/pps/pps.c @@ -406,7 +406,7 @@ static int __init pps_init(void) pr_err("failed to allocate class\n"); return PTR_ERR(pps_class); } - pps_class->dev_attrs = pps_attrs; + pps_class->dev_groups = pps_groups; err = alloc_chrdev_region(&pps_devt, 0, PPS_MAX_SOURCES, "pps"); if (err < 0) { diff --git a/drivers/pps/sysfs.c b/drivers/pps/sysfs.c index ef0978c71eee..aefb75d67094 100644 --- a/drivers/pps/sysfs.c +++ b/drivers/pps/sysfs.c @@ -29,8 +29,8 @@ * Attribute functions */ -static ssize_t pps_show_assert(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t assert_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); @@ -41,9 +41,10 @@ static ssize_t pps_show_assert(struct device *dev, (long long) pps->assert_tu.sec, pps->assert_tu.nsec, pps->assert_sequence); } +static DEVICE_ATTR_RO(assert); -static ssize_t pps_show_clear(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t clear_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); @@ -54,45 +55,59 @@ static ssize_t pps_show_clear(struct device *dev, (long long) pps->clear_tu.sec, pps->clear_tu.nsec, pps->clear_sequence); } +static DEVICE_ATTR_RO(clear); -static ssize_t pps_show_mode(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t mode_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); return sprintf(buf, "%4x\n", pps->info.mode); } +static DEVICE_ATTR_RO(mode); -static ssize_t pps_show_echo(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t echo_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); return sprintf(buf, "%d\n", !!pps->info.echo); } +static DEVICE_ATTR_RO(echo); -static ssize_t pps_show_name(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t name_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); return sprintf(buf, "%s\n", pps->info.name); } +static DEVICE_ATTR_RO(name); -static ssize_t pps_show_path(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t path_show(struct device *dev, struct device_attribute *attr, + char *buf) { struct pps_device *pps = dev_get_drvdata(dev); return sprintf(buf, "%s\n", pps->info.path); } +static DEVICE_ATTR_RO(path); + +static struct attribute *pps_attrs[] = { + &dev_attr_assert.attr, + &dev_attr_clear.attr, + &dev_attr_mode.attr, + &dev_attr_echo.attr, + &dev_attr_name.attr, + &dev_attr_path.attr, + NULL, +}; + +static const struct attribute_group pps_group = { + .attrs = pps_attrs, +}; -struct device_attribute pps_attrs[] = { - __ATTR(assert, S_IRUGO, pps_show_assert, NULL), - __ATTR(clear, S_IRUGO, pps_show_clear, NULL), - __ATTR(mode, S_IRUGO, pps_show_mode, NULL), - __ATTR(echo, S_IRUGO, pps_show_echo, NULL), - __ATTR(name, S_IRUGO, pps_show_name, NULL), - __ATTR(path, S_IRUGO, pps_show_path, NULL), - __ATTR_NULL, +const struct attribute_group *pps_groups[] = { + &pps_group, + NULL, }; diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h index 7db3eb93a079..1d2cd21242e8 100644 --- a/include/linux/pps_kernel.h +++ b/include/linux/pps_kernel.h @@ -80,7 +80,7 @@ struct pps_device { * Global variables */ -extern struct device_attribute pps_attrs[]; +extern const struct attribute_group *pps_groups[]; /* * Internal functions. -- cgit v1.2.3 From 6853152689d47b4a1eb9f38a25a18f3f8b7a60de Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Tue, 20 Aug 2013 16:48:54 -0700 Subject: sysfs.h: fix __BIN_ATTR_RW() __BIN_ATTR_RW() wasn't passing in the _size field. As it would break the build if this macro was ever used, it's obvious no one had ever tried to use it before. Fix it so that it can be used. Signed-off-by: Greg Kroah-Hartman --- include/linux/sysfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 9e8a9b555ad6..0f04958623d7 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -153,7 +153,7 @@ struct bin_attribute { #define __BIN_ATTR_RW(_name, _size) __BIN_ATTR(_name, \ (S_IWUSR | S_IRUGO), _name##_read, \ - _name##_write) + _name##_write, _size) #define __BIN_ATTR_NULL __ATTR_NULL -- cgit v1.2.3 From 37a7bd6255b415afe197489b5cd1f9568a7ae058 Mon Sep 17 00:00:00 2001 From: Seth Jennings Date: Tue, 20 Aug 2013 12:13:01 -0500 Subject: drivers: base: reduce add_memory_section() for boot-time only Now that add_memory_section() is only called from boot time, reduce the logic and remove the enum. Signed-off-by: Seth Jennings Signed-off-by: Greg Kroah-Hartman --- drivers/base/memory.c | 41 ++++++++++++++--------------------------- include/linux/memory.h | 1 - 2 files changed, 14 insertions(+), 28 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 2e9a68c64679..a9e9c0902cce 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -602,40 +602,29 @@ static int init_memory_block(struct memory_block **memory, return ret; } -static int add_memory_section(int nid, struct mem_section *section, - struct memory_block **mem_p, - unsigned long state, enum mem_add_context context) +static int add_memory_section(struct mem_section *section, + struct memory_block **mem_p) { struct memory_block *mem = NULL; int scn_nr = __section_nr(section); int ret = 0; - if (context == BOOT) { - /* same memory block ? */ - if (mem_p && *mem_p) - if (scn_nr >= (*mem_p)->start_section_nr && - scn_nr <= (*mem_p)->end_section_nr) { - mem = *mem_p; - get_device(&mem->dev); - } - } else - mem = find_memory_block(section); + if (mem_p && *mem_p) { + if (scn_nr >= (*mem_p)->start_section_nr && + scn_nr <= (*mem_p)->end_section_nr) { + mem = *mem_p; + get_device(&mem->dev); + } + } if (mem) { mem->section_count++; put_device(&mem->dev); } else { - ret = init_memory_block(&mem, section, state); + ret = init_memory_block(&mem, section, MEM_ONLINE); /* store memory_block pointer for next loop */ - if (!ret && context == BOOT) - if (mem_p) - *mem_p = mem; - } - - if (!ret) { - if (context == HOTPLUG && - mem->section_count == sections_per_block) - ret = register_mem_sect_under_node(mem, nid); + if (!ret && mem_p) + *mem_p = mem; } return ret; @@ -764,10 +753,8 @@ int __init memory_dev_init(void) if (!present_section_nr(i)) continue; /* don't need to reuse memory_block if only one per block */ - err = add_memory_section(0, __nr_to_section(i), - (sections_per_block == 1) ? NULL : &mem, - MEM_ONLINE, - BOOT); + err = add_memory_section(__nr_to_section(i), + (sections_per_block == 1) ? NULL : &mem); if (!ret) ret = err; } diff --git a/include/linux/memory.h b/include/linux/memory.h index 85c31a8e2904..4c89fb0c8f4c 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -125,7 +125,6 @@ extern struct memory_block *find_memory_block_hinted(struct mem_section *, struct memory_block *); extern struct memory_block *find_memory_block(struct mem_section *); #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION< Date: Tue, 20 Aug 2013 16:05:05 -0500 Subject: drivers: base: use standard device online/offline for state change There are two ways to set the online/offline state for a memory block: echo 0|1 > online and echo online|online_kernel|online_movable|offline > state. The state attribute can online a memory block with extra data, the "online type", where the online attribute uses a default online type of ONLINE_KEEP, same as echo online > state. Currently there is a state_mutex that provides consistency between the memory block state and the underlying memory. The problem is that this code does a lot of things that the common device layer can do for us, such as the serialization of the online/offline handlers using the device lock, setting the dev->offline field, and calling kobject_uevent(). This patch refactors the online/offline code to allow the common device_[online|offline] functions to be used. The result is a simpler and more common code path for the two state setting mechanisms. It also removes the state_mutex from the struct memory_block as the memory block device lock provides the state consistency. No functional change is intended by this patch. Signed-off-by: Seth Jennings Signed-off-by: Greg Kroah-Hartman --- drivers/base/memory.c | 127 +++++++++++++++++++++---------------------------- include/linux/memory.h | 13 ++--- 2 files changed, 58 insertions(+), 82 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 0187fe483d7c..2a38cd2da2e5 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -16,7 +16,6 @@ #include #include #include -#include #include #include #include @@ -261,9 +260,8 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t return ret; } -static int __memory_block_change_state(struct memory_block *mem, - unsigned long to_state, unsigned long from_state_req, - int online_type) +static int memory_block_change_state(struct memory_block *mem, + unsigned long to_state, unsigned long from_state_req) { int ret = 0; @@ -273,105 +271,91 @@ static int __memory_block_change_state(struct memory_block *mem, if (to_state == MEM_OFFLINE) mem->state = MEM_GOING_OFFLINE; - ret = memory_block_action(mem->start_section_nr, to_state, online_type); + ret = memory_block_action(mem->start_section_nr, to_state, + mem->online_type); + mem->state = ret ? from_state_req : to_state; + return ret; } +/* The device lock serializes operations on memory_subsys_[online|offline] */ static int memory_subsys_online(struct device *dev) { struct memory_block *mem = container_of(dev, struct memory_block, dev); int ret; - mutex_lock(&mem->state_mutex); + if (mem->state == MEM_ONLINE) + return 0; - ret = mem->state == MEM_ONLINE ? 0 : - __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, - ONLINE_KEEP); + /* + * If we are called from store_mem_state(), online_type will be + * set >= 0 Otherwise we were called from the device online + * attribute and need to set the online_type. + */ + if (mem->online_type < 0) + mem->online_type = ONLINE_KEEP; + + ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); + + /* clear online_type */ + mem->online_type = -1; - mutex_unlock(&mem->state_mutex); return ret; } static int memory_subsys_offline(struct device *dev) { struct memory_block *mem = container_of(dev, struct memory_block, dev); - int ret; - mutex_lock(&mem->state_mutex); - - ret = mem->state == MEM_OFFLINE ? 0 : - __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); - - mutex_unlock(&mem->state_mutex); - return ret; -} + if (mem->state == MEM_OFFLINE) + return 0; -static int __memory_block_change_state_uevent(struct memory_block *mem, - unsigned long to_state, unsigned long from_state_req, - int online_type) -{ - int ret = __memory_block_change_state(mem, to_state, from_state_req, - online_type); - if (!ret) { - switch (mem->state) { - case MEM_OFFLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); - break; - case MEM_ONLINE: - kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); - break; - default: - break; - } - } - return ret; + return memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); } -static int memory_block_change_state(struct memory_block *mem, - unsigned long to_state, unsigned long from_state_req, - int online_type) -{ - int ret; - - mutex_lock(&mem->state_mutex); - ret = __memory_block_change_state_uevent(mem, to_state, from_state_req, - online_type); - mutex_unlock(&mem->state_mutex); - - return ret; -} static ssize_t store_mem_state(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct memory_block *mem; - bool offline; - int ret = -EINVAL; + int ret, online_type; mem = container_of(dev, struct memory_block, dev); lock_device_hotplug(); - if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) { - offline = false; - ret = memory_block_change_state(mem, MEM_ONLINE, - MEM_OFFLINE, ONLINE_KERNEL); - } else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) { - offline = false; - ret = memory_block_change_state(mem, MEM_ONLINE, - MEM_OFFLINE, ONLINE_MOVABLE); - } else if (!strncmp(buf, "online", min_t(int, count, 6))) { - offline = false; - ret = memory_block_change_state(mem, MEM_ONLINE, - MEM_OFFLINE, ONLINE_KEEP); - } else if(!strncmp(buf, "offline", min_t(int, count, 7))) { - offline = true; - ret = memory_block_change_state(mem, MEM_OFFLINE, - MEM_ONLINE, -1); + if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) + online_type = ONLINE_KERNEL; + else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) + online_type = ONLINE_MOVABLE; + else if (!strncmp(buf, "online", min_t(int, count, 6))) + online_type = ONLINE_KEEP; + else if (!strncmp(buf, "offline", min_t(int, count, 7))) + online_type = -1; + else + return -EINVAL; + + switch (online_type) { + case ONLINE_KERNEL: + case ONLINE_MOVABLE: + case ONLINE_KEEP: + /* + * mem->online_type is not protected so there can be a + * race here. However, when racing online, the first + * will succeed and the second will just return as the + * block will already be online. The online type + * could be either one, but that is expected. + */ + mem->online_type = online_type; + ret = device_online(&mem->dev); + break; + case -1: + ret = device_offline(&mem->dev); + break; + default: + ret = -EINVAL; /* should never happen */ } - if (!ret) - dev->offline = offline; unlock_device_hotplug(); @@ -592,7 +576,6 @@ static int init_memory_block(struct memory_block **memory, mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; mem->state = state; mem->section_count++; - mutex_init(&mem->state_mutex); start_pfn = section_nr_to_pfn(mem->start_section_nr); mem->phys_device = arch_get_memory_phys_device(start_pfn); diff --git a/include/linux/memory.h b/include/linux/memory.h index 4c89fb0c8f4c..9a6bbf76452d 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -25,16 +25,9 @@ struct memory_block { unsigned long start_section_nr; unsigned long end_section_nr; - unsigned long state; - int section_count; - - /* - * This serializes all state change requests. It isn't - * held during creation because the control files are - * created long after the critical areas during - * initialization. - */ - struct mutex state_mutex; + unsigned long state; /* serialized by the dev->lock */ + int section_count; /* serialized by mem_sysfs_mutex */ + int online_type; /* for passing data to online routine */ int phys_device; /* to which fru does this belong? */ void *hw; /* optional pointer to fw/hw data */ int (*phys_callback)(struct memory_block *); -- cgit v1.2.3 From 3e9b2bae8369661070622d05570cbcdfa01770e6 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 21 Aug 2013 13:47:50 -0700 Subject: sysfs: add sysfs_create/remove_groups() These functions are being open-coded in 3 different places in the driver core, and other driver subsystems will want to start doing this as well, so move it to the sysfs core to keep it all in one place, where we know it is written properly. Signed-off-by: Greg Kroah-Hartman --- drivers/base/bus.c | 23 ++-------------------- drivers/base/core.c | 22 ++------------------- drivers/base/driver.c | 22 ++------------------- fs/sysfs/group.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/sysfs.h | 4 ++++ 5 files changed, 64 insertions(+), 61 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 5ee5d3c1d74b..f099af0b41af 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -884,32 +884,13 @@ static void bus_remove_attrs(struct bus_type *bus) static int bus_add_groups(struct bus_type *bus, const struct attribute_group **groups) { - int error = 0; - int i; - - if (groups) { - for (i = 0; groups[i]; i++) { - error = sysfs_create_group(&bus->p->subsys.kobj, - groups[i]); - if (error) { - while (--i >= 0) - sysfs_remove_group(&bus->p->subsys.kobj, - groups[i]); - break; - } - } - } - return error; + return sysfs_create_groups(&bus->p->subsys.kobj, groups); } static void bus_remove_groups(struct bus_type *bus, const struct attribute_group **groups) { - int i; - - if (groups) - for (i = 0; groups[i]; i++) - sysfs_remove_group(&bus->p->subsys.kobj, groups[i]); + sysfs_remove_groups(&bus->p->subsys.kobj, groups); } static void klist_devices_get(struct klist_node *n) diff --git a/drivers/base/core.c b/drivers/base/core.c index af646afa5b7e..d743dcee1e77 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -493,31 +493,13 @@ static void device_remove_bin_attributes(struct device *dev, int device_add_groups(struct device *dev, const struct attribute_group **groups) { - int error = 0; - int i; - - if (groups) { - for (i = 0; groups[i]; i++) { - error = sysfs_create_group(&dev->kobj, groups[i]); - if (error) { - while (--i >= 0) - sysfs_remove_group(&dev->kobj, - groups[i]); - break; - } - } - } - return error; + return sysfs_create_groups(&dev->kobj, groups); } void device_remove_groups(struct device *dev, const struct attribute_group **groups) { - int i; - - if (groups) - for (i = 0; groups[i]; i++) - sysfs_remove_group(&dev->kobj, groups[i]); + sysfs_remove_groups(&dev->kobj, groups); } static int device_add_attrs(struct device *dev) diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 89db726ebb98..c7efccb6f3bb 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -126,31 +126,13 @@ EXPORT_SYMBOL_GPL(driver_remove_file); int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups) { - int error = 0; - int i; - - if (groups) { - for (i = 0; groups[i]; i++) { - error = sysfs_create_group(&drv->p->kobj, groups[i]); - if (error) { - while (--i >= 0) - sysfs_remove_group(&drv->p->kobj, - groups[i]); - break; - } - } - } - return error; + return sysfs_create_groups(&drv->p->kobj, groups); } void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups) { - int i; - - if (groups) - for (i = 0; groups[i]; i++) - sysfs_remove_group(&drv->p->kobj, groups[i]); + sysfs_remove_groups(&drv->p->kobj, groups); } /** diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index 09a1a25cd145..68baf8501552 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -130,6 +130,40 @@ int sysfs_create_group(struct kobject *kobj, return internal_create_group(kobj, 0, grp); } +/** + * sysfs_create_groups - given a directory kobject, create a bunch of attribute groups + * @kobj: The kobject to create the group on + * @groups: The attribute groups to create, NULL terminated + * + * This function creates a bunch of attribute groups. If an error occurs when + * creating a group, all previously created groups will be removed, unwinding + * everything back to the original state when this function was called. + * It will explicitly warn and error if any of the attribute files being + * created already exist. + * + * Returns 0 on success or error code from sysfs_create_groups on error. + */ +int sysfs_create_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ + int error = 0; + int i; + + if (!groups) + return 0; + + for (i = 0; groups[i]; i++) { + error = sysfs_create_group(kobj, groups[i]); + if (error) { + while (--i >= 0) + sysfs_remove_group(kobj, groups[i]); + break; + } + } + return error; +} +EXPORT_SYMBOL_GPL(sysfs_create_groups); + /** * sysfs_update_group - given a directory kobject, update an attribute group * @kobj: The kobject to update the group on @@ -178,6 +212,26 @@ void sysfs_remove_group(struct kobject * kobj, sysfs_put(sd); } +/** + * sysfs_remove_groups - remove a list of groups + * + * kobj: The kobject for the groups to be removed from + * groups: NULL terminated list of groups to be removed + * + * If groups is not NULL, the all groups will be removed from the kobject + */ +void sysfs_remove_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ + int i; + + if (!groups) + return; + for (i = 0; groups[i]; i++) + sysfs_remove_group(kobj, groups[i]); +} +EXPORT_SYMBOL_GPL(sysfs_remove_groups); + /** * sysfs_merge_group - merge files into a pre-existing attribute group. * @kobj: The kobject containing the group. diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 0f04958623d7..4dbb9d31daa8 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -215,10 +215,14 @@ void sysfs_delete_link(struct kobject *dir, struct kobject *targ, int __must_check sysfs_create_group(struct kobject *kobj, const struct attribute_group *grp); +int __must_check sysfs_create_groups(struct kobject *kobj, + const struct attribute_group **groups); int sysfs_update_group(struct kobject *kobj, const struct attribute_group *grp); void sysfs_remove_group(struct kobject *kobj, const struct attribute_group *grp); +void sysfs_remove_groups(struct kobject *kobj, + const struct attribute_group **groups); int sysfs_add_file_to_group(struct kobject *kobj, const struct attribute *attr, const char *group); void sysfs_remove_file_from_group(struct kobject *kobj, -- cgit v1.2.3 From 5da5c9c899dc456d6eb43aae3e8d4e853b7f5306 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 21 Aug 2013 17:47:05 -0700 Subject: sysfs: fix up minor coding style issues in sysfs.h As long as we are cleaning up sysfs coding style issues, don't forget the main sysfs.h file, so fix up the space issues there as well. Signed-off-by: Greg Kroah-Hartman --- include/linux/sysfs.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'include/linux') diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 4dbb9d31daa8..a864b8d918ee 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -51,9 +51,9 @@ do { \ static struct lock_class_key __key; \ \ (attr)->key = &__key; \ -} while(0) +} while (0) #else -#define sysfs_attr_init(attr) do {} while(0) +#define sysfs_attr_init(attr) do {} while (0) #endif struct attribute_group { @@ -69,7 +69,7 @@ struct attribute_group { * for examples.. */ -#define __ATTR(_name,_mode,_show,_store) { \ +#define __ATTR(_name, _mode, _show, _store) { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .show = _show, \ .store = _store, \ @@ -119,7 +119,7 @@ struct bin_attribute { void *private; ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *, char *, loff_t, size_t); - ssize_t (*write)(struct file *,struct kobject *, struct bin_attribute *, + ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *, char *, loff_t, size_t); int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr, struct vm_area_struct *vma); @@ -168,8 +168,8 @@ struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size) struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size) struct sysfs_ops { - ssize_t (*show)(struct kobject *, struct attribute *,char *); - ssize_t (*store)(struct kobject *,struct attribute *,const char *, size_t); + ssize_t (*show)(struct kobject *, struct attribute *, char *); + ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t); const void *(*namespace)(struct kobject *, const struct attribute *); }; -- cgit v1.2.3 From 3e1026b3fa2f61d33ce6a9e42a22398cc4ab8e58 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 22 Aug 2013 10:25:34 -0700 Subject: sysfs.h: remove attr_name() macro Gotta love a macro that doesn't reduce the typing you have to do. Also, only the driver core, and one network driver uses this. The driver core functions will be going away soon, and I'll convert the network driver soon to not need this as well, so delete it for now before anyone else gets some bright ideas and wants to use it. Signed-off-by: Greg Kroah-Hartman --- drivers/base/bus.c | 12 ++++++------ drivers/base/class.c | 4 ++-- drivers/base/core.c | 8 ++++---- drivers/net/ethernet/sun/niu.c | 2 +- include/linux/sysfs.h | 2 -- 5 files changed, 13 insertions(+), 15 deletions(-) (limited to 'include/linux') diff --git a/drivers/base/bus.c b/drivers/base/bus.c index f099af0b41af..235e2b06ac05 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -460,7 +460,7 @@ static int device_add_attrs(struct bus_type *bus, struct device *dev) if (!bus->dev_attrs) return 0; - for (i = 0; attr_name(bus->dev_attrs[i]); i++) { + for (i = 0; bus->dev_attrs[i].attr.name; i++) { error = device_create_file(dev, &bus->dev_attrs[i]); if (error) { while (--i >= 0) @@ -476,7 +476,7 @@ static void device_remove_attrs(struct bus_type *bus, struct device *dev) int i; if (bus->dev_attrs) { - for (i = 0; attr_name(bus->dev_attrs[i]); i++) + for (i = 0; bus->dev_attrs[i].attr.name; i++) device_remove_file(dev, &bus->dev_attrs[i]); } } @@ -596,7 +596,7 @@ static int driver_add_attrs(struct bus_type *bus, struct device_driver *drv) int i; if (bus->drv_attrs) { - for (i = 0; attr_name(bus->drv_attrs[i]); i++) { + for (i = 0; bus->drv_attrs[i].attr.name; i++) { error = driver_create_file(drv, &bus->drv_attrs[i]); if (error) goto err; @@ -616,7 +616,7 @@ static void driver_remove_attrs(struct bus_type *bus, int i; if (bus->drv_attrs) { - for (i = 0; attr_name(bus->drv_attrs[i]); i++) + for (i = 0; bus->drv_attrs[i].attr.name; i++) driver_remove_file(drv, &bus->drv_attrs[i]); } } @@ -857,7 +857,7 @@ static int bus_add_attrs(struct bus_type *bus) int i; if (bus->bus_attrs) { - for (i = 0; attr_name(bus->bus_attrs[i]); i++) { + for (i = 0; bus->bus_attrs[i].attr.name; i++) { error = bus_create_file(bus, &bus->bus_attrs[i]); if (error) goto err; @@ -876,7 +876,7 @@ static void bus_remove_attrs(struct bus_type *bus) int i; if (bus->bus_attrs) { - for (i = 0; attr_name(bus->bus_attrs[i]); i++) + for (i = 0; bus->bus_attrs[i].attr.name; i++) bus_remove_file(bus, &bus->bus_attrs[i]); } } diff --git a/drivers/base/class.c b/drivers/base/class.c index 3ce845471327..8b7818b80056 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -135,7 +135,7 @@ static int add_class_attrs(struct class *cls) int error = 0; if (cls->class_attrs) { - for (i = 0; attr_name(cls->class_attrs[i]); i++) { + for (i = 0; cls->class_attrs[i].attr.name; i++) { error = class_create_file(cls, &cls->class_attrs[i]); if (error) goto error; @@ -154,7 +154,7 @@ static void remove_class_attrs(struct class *cls) int i; if (cls->class_attrs) { - for (i = 0; attr_name(cls->class_attrs[i]); i++) + for (i = 0; cls->class_attrs[i].attr.name; i++) class_remove_file(cls, &cls->class_attrs[i]); } } diff --git a/drivers/base/core.c b/drivers/base/core.c index d743dcee1e77..ae1acdf21bd3 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -440,7 +440,7 @@ static int device_add_attributes(struct device *dev, int i; if (attrs) { - for (i = 0; attr_name(attrs[i]); i++) { + for (i = 0; attrs[i].attr.name; i++) { error = device_create_file(dev, &attrs[i]); if (error) break; @@ -458,7 +458,7 @@ static void device_remove_attributes(struct device *dev, int i; if (attrs) - for (i = 0; attr_name(attrs[i]); i++) + for (i = 0; attrs[i].attr.name; i++) device_remove_file(dev, &attrs[i]); } @@ -469,7 +469,7 @@ static int device_add_bin_attributes(struct device *dev, int i; if (attrs) { - for (i = 0; attr_name(attrs[i]); i++) { + for (i = 0; attrs[i].attr.name; i++) { error = device_create_bin_file(dev, &attrs[i]); if (error) break; @@ -487,7 +487,7 @@ static void device_remove_bin_attributes(struct device *dev, int i; if (attrs) - for (i = 0; attr_name(attrs[i]); i++) + for (i = 0; attrs[i].attr.name; i++) device_remove_bin_file(dev, &attrs[i]); } diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c index fa322409bff3..52b2adf63cbf 100644 --- a/drivers/net/ethernet/sun/niu.c +++ b/drivers/net/ethernet/sun/niu.c @@ -9478,7 +9478,7 @@ static struct niu_parent *niu_new_parent(struct niu *np, if (IS_ERR(plat_dev)) return NULL; - for (i = 0; attr_name(niu_parent_attributes[i]); i++) { + for (i = 0; niu_parent_attributes[i].attr.name; i++) { int err = device_create_file(&plat_dev->dev, &niu_parent_attributes[i]); if (err) diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index a864b8d918ee..b5a9d9b26bd4 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -108,8 +108,6 @@ static const struct attribute_group _name##_group = { \ }; \ __ATTRIBUTE_GROUPS(_name) -#define attr_name(_attr) (_attr).attr.name - struct file; struct vm_area_struct; -- cgit v1.2.3 From a65fcce75a75c0d41b938f86d09d42b6f1733309 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 23 Aug 2013 15:02:01 -0700 Subject: sysfs: create __ATTR_WO() This creates the macro __ATTR_WO() for write-only attributes, instead of having to "open define" them. Signed-off-by: Greg Kroah-Hartman --- include/linux/sysfs.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index b5a9d9b26bd4..69c1ff003628 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -80,6 +80,11 @@ struct attribute_group { .show = _name##_show, \ } +#define __ATTR_WO(_name) { \ + .attr = { .name = __stringify(_name), .mode = S_IWUSR }, \ + .store = _name##_store, \ +} + #define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \ _name##_show, _name##_store) -- cgit v1.2.3 From 1130c55c757660ac83bd2de220f08580c56b6855 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 23 Aug 2013 15:02:56 -0700 Subject: driver core: create write-only attribute macros for devices and drivers This creates the macros DRIVER_ATTR_WO() and DEVICE_ATTR_WO() for write-only attributes for drivers and devices. Signed-off-by: Greg Kroah-Hartman --- include/linux/device.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/device.h b/include/linux/device.h index 26e23b22ed0a..0ed94b5f67fc 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -277,6 +277,8 @@ struct driver_attribute { struct driver_attribute driver_attr_##_name = __ATTR_RW(_name) #define DRIVER_ATTR_RO(_name) \ struct driver_attribute driver_attr_##_name = __ATTR_RO(_name) +#define DRIVER_ATTR_WO(_name) \ + struct driver_attribute driver_attr_##_name = __ATTR_WO(_name) extern int __must_check driver_create_file(struct device_driver *driver, const struct driver_attribute *attr); @@ -534,6 +536,8 @@ ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, struct device_attribute dev_attr_##_name = __ATTR_RW(_name) #define DEVICE_ATTR_RO(_name) \ struct device_attribute dev_attr_##_name = __ATTR_RO(_name) +#define DEVICE_ATTR_WO(_name) \ + struct device_attribute dev_attr_##_name = __ATTR_WO(_name) #define DEVICE_ULONG_ATTR(_name, _mode, _var) \ struct dev_ext_attribute dev_attr_##_name = \ { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) } -- cgit v1.2.3 From f799878000c5a9a1e6a311dfd4faa50601dcb1f8 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Tue, 27 Aug 2013 17:24:49 -0700 Subject: sysfs: add sysfs_create/remove_groups for when SYSFS is not enabled We need these functions for when CONFIG_SYSFS=n. Reported-by: Fengguang Wu Signed-off-by: Greg Kroah-Hartman --- include/linux/sysfs.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux') diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 69c1ff003628..e647a1aa0723 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -350,6 +350,11 @@ static inline int sysfs_create_group(struct kobject *kobj, return 0; } +static inline int sysfs_create_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ +} + static inline int sysfs_update_group(struct kobject *kobj, const struct attribute_group *grp) { @@ -361,6 +366,11 @@ static inline void sysfs_remove_group(struct kobject *kobj, { } +static inline void sysfs_remove_groups(struct kobject *kobj, + const struct attribute_group **groups) +{ +} + static inline int sysfs_add_file_to_group(struct kobject *kobj, const struct attribute *attr, const char *group) { -- cgit v1.2.3 From 3159269ef484954985cbbf1ff89976f090a18b24 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 26 Aug 2013 09:58:30 +0200 Subject: debugfs: provide debugfs_create_x64() when disabled commit 15b0beaa332b3923cc ("Add x64 support to debugfs") added debugfs_create_x64(), but forgot to provide it when debugfs is disabled, causing problems when code tries to use it even then. Provide the appropriate static inline. Cc: Huang Ying Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- include/linux/debugfs.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux') diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index d68b4ea7343c..263489d0788d 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -192,6 +192,13 @@ static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode, return ERR_PTR(-ENODEV); } +static inline struct dentry *debugfs_create_x64(const char *name, umode_t mode, + struct dentry *parent, + u64 *value) +{ + return ERR_PTR(-ENODEV); +} + static inline struct dentry *debugfs_create_size_t(const char *name, umode_t mode, struct dentry *parent, size_t *value) -- cgit v1.2.3 From 574979c617eb9593f8dfbb804da3f0e00f8bf28e Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 28 Aug 2013 09:51:41 -0700 Subject: sysfs: sysfs_create_groups returns a value. When I included the "empty" function for sysfs_create_groups() when CONFIG_SYSFS=n, I forgot to return a value for it, so things blew up the build. This patch fixes that, stupid me. Reported-by: kbuild test robot Signed-off-by: Greg Kroah-Hartman --- include/linux/sysfs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index e647a1aa0723..11baec7c9b26 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -353,6 +353,7 @@ static inline int sysfs_create_group(struct kobject *kobj, static inline int sysfs_create_groups(struct kobject *kobj, const struct attribute_group **groups) { + return 0; } static inline int sysfs_update_group(struct kobject *kobj, -- cgit v1.2.3