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authormochel@digitalimplant.org <mochel@digitalimplant.org>2005-03-24 19:08:30 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-20 15:15:23 -0700
commit36239577cfb6b9a7c111209536b54200b0252ebf (patch)
treef8fa5034fbb31d273d0889119cbc20e4c4b0c983 /drivers/base
parent9a881f166f473373589ce6f3fdc47b44a1450e2d (diff)
downloadlwn-36239577cfb6b9a7c111209536b54200b0252ebf.tar.gz
lwn-36239577cfb6b9a7c111209536b54200b0252ebf.zip
[PATCH] Use a klist for device child lists.
- Use klist iterator in device_for_each_child(), making it safe to use for removing devices. - Remove unused list_to_dev() function. - Kills all usage of devices_subsys.rwsem. Signed-off-by: Patrick Mochel <mochel@digitalimplant.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/core.c30
1 files changed, 15 insertions, 15 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index bfa4268289ea..1d8c7790b55a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -207,8 +207,7 @@ void device_initialize(struct device *dev)
{
kobj_set_kset_s(dev, devices_subsys);
kobject_init(&dev->kobj);
- INIT_LIST_HEAD(&dev->node);
- INIT_LIST_HEAD(&dev->children);
+ klist_init(&dev->klist_children);
INIT_LIST_HEAD(&dev->dma_pools);
init_MUTEX(&dev->sem);
}
@@ -249,10 +248,8 @@ int device_add(struct device *dev)
goto PMError;
if ((error = bus_add_device(dev)))
goto BusError;
- down_write(&devices_subsys.rwsem);
if (parent)
- list_add_tail(&dev->node, &parent->children);
- up_write(&devices_subsys.rwsem);
+ klist_add_tail(&parent->klist_children, &dev->knode_parent);
/* notify platform of device entry */
if (platform_notify)
@@ -335,10 +332,8 @@ void device_del(struct device * dev)
{
struct device * parent = dev->parent;
- down_write(&devices_subsys.rwsem);
if (parent)
- list_del_init(&dev->node);
- up_write(&devices_subsys.rwsem);
+ klist_remove(&dev->knode_parent);
/* Notify the platform of the removal, in case they
* need to do anything...
@@ -372,6 +367,12 @@ void device_unregister(struct device * dev)
}
+static struct device * next_device(struct klist_iter * i)
+{
+ struct klist_node * n = klist_next(i);
+ return n ? container_of(n, struct device, knode_parent) : NULL;
+}
+
/**
* device_for_each_child - device child iterator.
* @dev: parent struct device.
@@ -384,18 +385,17 @@ void device_unregister(struct device * dev)
* We check the return of @fn each time. If it returns anything
* other than 0, we break out and return that value.
*/
-int device_for_each_child(struct device * dev, void * data,
+int device_for_each_child(struct device * parent, void * data,
int (*fn)(struct device *, void *))
{
+ struct klist_iter i;
struct device * child;
int error = 0;
- down_read(&devices_subsys.rwsem);
- list_for_each_entry(child, &dev->children, node) {
- if((error = fn(child, data)))
- break;
- }
- up_read(&devices_subsys.rwsem);
+ klist_iter_init(&parent->klist_children, &i);
+ while ((child = next_device(&i)) && !error)
+ error = fn(child, data);
+ klist_iter_exit(&i);
return error;
}