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authorGreg Kroah-Hartman <gregkh@suse.de>2010-02-17 10:57:05 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-07 17:04:52 -0800
commit8e9394ce2412254ec69fd2a4f3e44a66eade2297 (patch)
tree355f25148b4ce3f5cfebeaf0939d71cb6beaf88b /drivers/base/dd.c
parent62e877b893e6350c900d381f353aa62ed48dcc97 (diff)
Driver core: create lock/unlock functions for struct device
In the future, we are going to be changing the lock type for struct device (once we get the lockdep infrastructure properly worked out) To make that changeover easier, and to possibly burry the lock in a different part of struct device, let's create some functions to lock and unlock a device so that no out-of-core code needs to be changed in the future. This patch creates the device_lock/unlock/trylock() functions, and converts all in-tree users to them. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jean Delvare <khali@linux-fr.org> Cc: Dave Young <hidave.darkstar@gmail.com> Cc: Ming Lei <tom.leiming@gmail.com> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Phil Carmody <ext-phil.2.carmody@nokia.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Cc: Len Brown <len.brown@intel.com> Cc: Magnus Damm <damm@igel.co.jp> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Vegard Nossum <vegard.nossum@gmail.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Alex Chiang <achiang@hp.com> Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andrew Patterson <andrew.patterson@hp.com> Cc: Yu Zhao <yu.zhao@intel.com> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Wolfram Sang <w.sang@pengutronix.de> Cc: CHENG Renquan <rqcheng@smu.edu.sg> Cc: Oliver Neukum <oliver@neukum.org> Cc: Frans Pop <elendil@planet.nl> Cc: David Vrabel <david.vrabel@csr.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/dd.c')
-rw-r--r--drivers/base/dd.c38
1 files changed, 19 insertions, 19 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index ee95c76bfd3..c89291f8a16 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -85,7 +85,7 @@ static void driver_sysfs_remove(struct device *dev)
* for before calling this. (It is ok to call with no other effort
* from a driver's probe() method.)
*
- * This function must be called with @dev->sem held.
+ * This function must be called with the device lock held.
*/
int device_bind_driver(struct device *dev)
{
@@ -190,8 +190,8 @@ EXPORT_SYMBOL_GPL(wait_for_device_probe);
* This function returns -ENODEV if the device is not registered,
* 1 if the device is bound successfully and 0 otherwise.
*
- * This function must be called with @dev->sem held. When called for a
- * USB interface, @dev->parent->sem must be held as well.
+ * This function must be called with @dev lock held. When called for a
+ * USB interface, @dev->parent lock must be held as well.
*/
int driver_probe_device(struct device_driver *drv, struct device *dev)
{
@@ -233,13 +233,13 @@ static int __device_attach(struct device_driver *drv, void *data)
* 0 if no matching driver was found;
* -ENODEV if the device is not registered.
*
- * When called for a USB interface, @dev->parent->sem must be held.
+ * When called for a USB interface, @dev->parent lock must be held.
*/
int device_attach(struct device *dev)
{
int ret = 0;
- down(&dev->sem);
+ device_lock(dev);
if (dev->driver) {
ret = device_bind_driver(dev);
if (ret == 0)
@@ -253,7 +253,7 @@ int device_attach(struct device *dev)
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
pm_runtime_put_sync(dev);
}
- up(&dev->sem);
+ device_unlock(dev);
return ret;
}
EXPORT_SYMBOL_GPL(device_attach);
@@ -276,13 +276,13 @@ static int __driver_attach(struct device *dev, void *data)
return 0;
if (dev->parent) /* Needed for USB */
- down(&dev->parent->sem);
- down(&dev->sem);
+ device_lock(dev->parent);
+ device_lock(dev);
if (!dev->driver)
driver_probe_device(drv, dev);
- up(&dev->sem);
+ device_unlock(dev);
if (dev->parent)
- up(&dev->parent->sem);
+ device_unlock(dev->parent);
return 0;
}
@@ -303,8 +303,8 @@ int driver_attach(struct device_driver *drv)
EXPORT_SYMBOL_GPL(driver_attach);
/*
- * __device_release_driver() must be called with @dev->sem held.
- * When called for a USB interface, @dev->parent->sem must be held as well.
+ * __device_release_driver() must be called with @dev lock held.
+ * When called for a USB interface, @dev->parent lock must be held as well.
*/
static void __device_release_driver(struct device *dev)
{
@@ -343,7 +343,7 @@ static void __device_release_driver(struct device *dev)
* @dev: device.
*
* Manually detach device from driver.
- * When called for a USB interface, @dev->parent->sem must be held.
+ * When called for a USB interface, @dev->parent lock must be held.
*/
void device_release_driver(struct device *dev)
{
@@ -352,9 +352,9 @@ void device_release_driver(struct device *dev)
* within their ->remove callback for the same device, they
* will deadlock right here.
*/
- down(&dev->sem);
+ device_lock(dev);
__device_release_driver(dev);
- up(&dev->sem);
+ device_unlock(dev);
}
EXPORT_SYMBOL_GPL(device_release_driver);
@@ -381,13 +381,13 @@ void driver_detach(struct device_driver *drv)
spin_unlock(&drv->p->klist_devices.k_lock);
if (dev->parent) /* Needed for USB */
- down(&dev->parent->sem);
- down(&dev->sem);
+ device_lock(dev->parent);
+ device_lock(dev);
if (dev->driver == drv)
__device_release_driver(dev);
- up(&dev->sem);
+ device_unlock(dev);
if (dev->parent)
- up(&dev->parent->sem);
+ device_unlock(dev->parent);
put_device(dev);
}
}