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authorRichard Purdie <rpurdie@rpsys.net>2007-02-08 22:25:09 +0000
committerRichard Purdie <rpurdie@rpsys.net>2007-02-20 08:38:45 +0000
commit28ee086d5b36aab2931f6740e409bb0fb6c65e5f (patch)
tree0a308c80affcc39c2c869f29f1109e5ee9d6140f /drivers/video/nvidia
parenta8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff)
downloadlinux-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.gz
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/video/nvidia')
-rw-r--r--drivers/video/nvidia/nv_backlight.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
index 4254c090dc4..f5e42d0bd0d 100644
--- a/drivers/video/nvidia/nv_backlight.c
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -114,10 +114,8 @@ void nvidia_bl_set_power(struct fb_info *info, int power)
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
- down(&info->bl_dev->sem);
info->bl_dev->props->power = power;
__nvidia_bl_update_status(info->bl_dev);
- up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
@@ -154,11 +152,9 @@ void nvidia_bl_init(struct nvidia_par *par)
0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
mutex_unlock(&info->bl_mutex);
- down(&bd->sem);
bd->props->brightness = nvidia_bl_data.max_brightness;
bd->props->power = FB_BLANK_UNBLANK;
- bd->props->update_status(bd);
- up(&bd->sem);
+ backlight_update_status(bd);
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_lock(&pmac_backlight_mutex);