From 28ee086d5b36aab2931f6740e409bb0fb6c65e5f Mon Sep 17 00:00:00 2001 From: Richard Purdie Date: Thu, 8 Feb 2007 22:25:09 +0000 Subject: 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 --- drivers/misc/asus-laptop.c | 20 +++++--------------- 1 file changed, 5 insertions(+), 15 deletions(-) (limited to 'drivers/misc') diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c index d15ee5e3420..7ace5b9a3d2 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; } -- cgit v1.2.3