aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/traps.c
diff options
context:
space:
mode:
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 /arch/powerpc/kernel/traps.c
parenta8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff)
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 'arch/powerpc/kernel/traps.c')
-rw-r--r--arch/powerpc/kernel/traps.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index dcc6f159fd9..35ce07b6a5b 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -107,12 +107,10 @@ int die(const char *str, struct pt_regs *regs, long err)
if (machine_is(powermac) && pmac_backlight) {
struct backlight_properties *props;
- down(&pmac_backlight->sem);
props = pmac_backlight->props;
props->brightness = props->max_brightness;
props->power = FB_BLANK_UNBLANK;
- props->update_status(pmac_backlight);
- up(&pmac_backlight->sem);
+ backlight_update_status(pmac_backlight);
}
mutex_unlock(&pmac_backlight_mutex);
#endif