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author | Richard Purdie <rpurdie@rpsys.net> | 2007-02-08 22:25:09 +0000 |
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committer | Richard Purdie <rpurdie@rpsys.net> | 2007-02-20 08:38:45 +0000 |
commit | 28ee086d5b36aab2931f6740e409bb0fb6c65e5f (patch) | |
tree | 0a308c80affcc39c2c869f29f1109e5ee9d6140f /drivers/misc/asus-laptop.c | |
parent | a8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff) | |
download | kernel_samsung_smdk4412-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.zip kernel_samsung_smdk4412-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.gz kernel_samsung_smdk4412-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.bz2 |
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/misc/asus-laptop.c')
-rw-r--r-- | drivers/misc/asus-laptop.c | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c index d15ee5e..7ace5b9 100644 --- a/drivers/misc/asus-laptop.c +++ b/drivers/misc/asus-laptop.c @@ -348,13 +348,8 @@ static void lcd_blank(int blank) struct backlight_device *bd = asus_backlight_device; if (bd) { - down(&bd->sem); - if (likely(bd->props)) { - bd->props->power = blank; - if (likely(bd->props->update_status)) - bd->props->update_status(bd); - } - up(&bd->sem); + bd->props->power = blank; + backlight_update_status(bd); } } @@ -1028,14 +1023,9 @@ static int asus_backlight_init(struct device *dev) asus_backlight_device = bd; - down(&bd->sem); - if (likely(bd->props)) { - bd->props->brightness = read_brightness(NULL); - bd->props->power = FB_BLANK_UNBLANK; - if (likely(bd->props->update_status)) - bd->props->update_status(bd); - } - up(&bd->sem); + bd->props->brightness = read_brightness(NULL); + bd->props->power = FB_BLANK_UNBLANK; + backlight_update_status(bd); } return 0; } |