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authorRichard Purdie <rpurdie@rpsys.net>2007-02-09 01:25:09 +0300
committerRichard Purdie <rpurdie@rpsys.net>2007-02-20 11:38:45 +0300
commit28ee086d5b36aab2931f6740e409bb0fb6c65e5f (patch)
tree0a308c80affcc39c2c869f29f1109e5ee9d6140f /drivers/macintosh
parenta8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff)
downloadlinux-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.xz
backlight: Fix external uses of backlight internal semaphore
backlight_device->sem has a very specific use as documented in the header file. The external users of this are using it for a different reason, to serialise access to the update_status() method. backlight users were supposed to implement their own internal serialisation of update_status() if needed but everyone is doing things differently and incorrectly. Therefore add a global mutex to take care of serialisation for everyone, once and for all. Locking for get_brightness remains optional since most users don't need it. Also update the lcd class in a similar way. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'drivers/macintosh')
-rw-r--r--drivers/macintosh/via-pmu-backlight.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/macintosh/via-pmu-backlight.c b/drivers/macintosh/via-pmu-backlight.c
index db8bcc35bc03..7ba2042b2dd0 100644
--- a/drivers/macintosh/via-pmu-backlight.c
+++ b/drivers/macintosh/via-pmu-backlight.c
@@ -166,11 +166,9 @@ void __init pmu_backlight_init()
pmu_backlight_data.max_brightness / 15);
}
- down(&bd->sem);
bd->props->brightness = level;
bd->props->power = FB_BLANK_UNBLANK;
- bd->props->update_status(bd);
- up(&bd->sem);
+ backlight_update_status(bd);
mutex_lock(&pmac_backlight_mutex);
if (!pmac_backlight)