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backlight: Convert semaphore -> mutex

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Convert internal semaphore to a mutex

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Richard Purdie 2007-02-08 22:53:55 +00:00
parent 28ee086d5b
commit 249040dc7f
4 changed files with 37 additions and 37 deletions
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6
include/linux/backlight.h
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@ -14,8 +14,8 @@
/* Notes on locking:
*
* backlight_device->sem is an internal backlight lock protecting the props
* field and no code outside the core should need to touch it.
* backlight_device->props_lock is an internal backlight lock protecting the
* props field and no code outside the core should need to touch it.
*
* Access to update_status() is serialised by the update_lock mutex since
* most drivers seem to need this and historically get it wrong.
@ -57,7 +57,7 @@ struct backlight_device {
/* This protects the 'props' field. If 'props' is NULL, the driver that
registered this device has been unloaded, and if class_get_devdata()
points to something in the body of that driver, it is also invalid. */
struct semaphore sem;
struct mutex props_lock;
/* If this is NULL, the backing module is unloaded */
struct backlight_properties *props;
/* Serialise access to update_status method */