diff options
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index f75344ac4663..3495ab4035ec 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -34,11 +34,11 @@ #include <linux/mutex.h> #include <linux/completion.h> #include <asm/uaccess.h> +#include <asm/semaphore.h> #include "i2c-core.h" -static LIST_HEAD(adapters); static LIST_HEAD(drivers); static DEFINE_MUTEX(core_lists); static DEFINE_IDR(i2c_adapter_idr); @@ -331,7 +331,6 @@ static int i2c_register_adapter(struct i2c_adapter *adap) INIT_LIST_HEAD(&adap->clients); mutex_lock(&core_lists); - list_add_tail(&adap->list, &adapters); /* Add the adapter to the driver core. * If the parent pointer is not set up, @@ -368,7 +367,6 @@ out_unlock: return res; out_list: - list_del(&adap->list); idr_remove(&i2c_adapter_idr, adap->nr); goto out_unlock; } @@ -473,7 +471,6 @@ EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter); int i2c_del_adapter(struct i2c_adapter *adap) { struct list_head *item, *_n; - struct i2c_adapter *adap_from_list; struct i2c_driver *driver; struct i2c_client *client; int res = 0; @@ -481,11 +478,7 @@ int i2c_del_adapter(struct i2c_adapter *adap) mutex_lock(&core_lists); /* First make sure that this adapter was ever added */ - list_for_each_entry(adap_from_list, &adapters, list) { - if (adap_from_list == adap) - break; - } - if (adap_from_list != adap) { + if (idr_find(&i2c_adapter_idr, adap->nr) != adap) { pr_debug("i2c-core: attempting to delete unregistered " "adapter [%s]\n", adap->name); res = -EINVAL; @@ -529,7 +522,6 @@ int i2c_del_adapter(struct i2c_adapter *adap) /* clean up the sysfs representation */ init_completion(&adap->dev_released); device_unregister(&adap->dev); - list_del(&adap->list); /* wait for sysfs to drop all references */ wait_for_completion(&adap->dev_released); @@ -592,9 +584,12 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) if (driver->attach_adapter) { struct i2c_adapter *adapter; - list_for_each_entry(adapter, &adapters, list) { + down(&i2c_adapter_class.sem); + list_for_each_entry(adapter, &i2c_adapter_class.devices, + dev.node) { driver->attach_adapter(adapter); } + up(&i2c_adapter_class.sem); } mutex_unlock(&core_lists); @@ -609,7 +604,7 @@ EXPORT_SYMBOL(i2c_register_driver); */ void i2c_del_driver(struct i2c_driver *driver) { - struct list_head *item1, *item2, *_n; + struct list_head *item2, *_n; struct i2c_client *client; struct i2c_adapter *adap; @@ -623,8 +618,8 @@ void i2c_del_driver(struct i2c_driver *driver) * attached. If so, detach them to be able to kill the driver * afterwards. */ - list_for_each(item1,&adapters) { - adap = list_entry(item1, struct i2c_adapter, list); + down(&i2c_adapter_class.sem); + list_for_each_entry(adap, &i2c_adapter_class.devices, dev.node) { if (driver->detach_adapter) { if (driver->detach_adapter(adap)) { dev_err(&adap->dev, "detach_adapter failed " @@ -648,6 +643,7 @@ void i2c_del_driver(struct i2c_driver *driver) } } } + up(&i2c_adapter_class.sem); unregister: driver_unregister(&driver->driver); |