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| author | Richard Purdie <rpurdie@rpsys.net> | 2007-02-08 22:25:09 +0000 |
|---|---|---|
| committer | Richard Purdie <rpurdie@rpsys.net> | 2007-02-20 08:38:45 +0000 |
| commit | 28ee086d5b36aab2931f6740e409bb0fb6c65e5f (patch) | |
| tree | 0a308c80affcc39c2c869f29f1109e5ee9d6140f /drivers/video/chipsfb.c | |
| parent | a8db3c1948eb30cd6988b5b96b654f591e6280b1 (diff) | |
| download | lwn-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.tar.gz lwn-28ee086d5b36aab2931f6740e409bb0fb6c65e5f.zip | |
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/chipsfb.c')
| -rw-r--r-- | drivers/video/chipsfb.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/video/chipsfb.c b/drivers/video/chipsfb.c index 73cb426bf2d7..9a656bc6295c 100644 --- a/drivers/video/chipsfb.c +++ b/drivers/video/chipsfb.c @@ -153,13 +153,11 @@ static int chipsfb_blank(int blank, struct fb_info *info) * useful at blank = 1 too (saves battery, extends backlight * life) */ - down(&pmac_backlight->sem); if (blank) pmac_backlight->props->power = FB_BLANK_POWERDOWN; else pmac_backlight->props->power = FB_BLANK_UNBLANK; - pmac_backlight->props->update_status(pmac_backlight); - up(&pmac_backlight->sem); + backlight_update_status(pmac_backlight); } mutex_unlock(&pmac_backlight_mutex); @@ -415,10 +413,8 @@ chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent) /* turn on the backlight */ mutex_lock(&pmac_backlight_mutex); if (pmac_backlight) { - down(&pmac_backlight->sem); pmac_backlight->props->power = FB_BLANK_UNBLANK; - pmac_backlight->props->update_status(pmac_backlight); - up(&pmac_backlight->sem); + backlight_update_status(pmac_backlight); } mutex_unlock(&pmac_backlight_mutex); #endif /* CONFIG_PMAC_BACKLIGHT */ |