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backlight: Fix external uses of backlight internal semaphore

Browse source 
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 <[email protected]>
This commit is contained in:
Richard Purdie 2007-02-08 22:25:09 +00:00
commit 28ee086d5b
15 changed files with 76 additions and 76 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/video/aty/aty128fb.c
View file

@ -1807,10 +1807,8 @@ static void aty128_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;
__aty128_bl_update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
@ -1847,11 +1845,9 @@ static void aty128_bl_init(struct aty128fb_par *par)
219 * FB_BACKLIGHT_MAX / MAX_LEVEL);
mutex_unlock(&info->bl_mutex);
down(&bd->sem);
bd->props->brightness = aty128_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);

6
drivers/video/aty/atyfb_base.c
View file

@ -2188,10 +2188,8 @@ static void aty_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;
__aty_bl_update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
@ -2224,11 +2222,9 @@ static void aty_bl_init(struct atyfb_par *par)
0xFF * FB_BACKLIGHT_MAX / MAX_LEVEL);
mutex_unlock(&info->bl_mutex);
down(&bd->sem);
bd->props->brightness = aty_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);

4
drivers/video/aty/radeon_backlight.c
View file

@ -194,11 +194,9 @@ void radeonfb_bl_init(struct radeonfb_info *rinfo)
217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
mutex_unlock(&rinfo->info->bl_mutex);
down(&bd->sem);
bd->props->brightness = radeon_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);

10
drivers/video/backlight/backlight.c
View file

@ -37,8 +37,7 @@ static int fb_notifier_callback(struct notifier_block *self,
if (!bd->props->check_fb ||
bd->props->check_fb(evdata->info)) {
bd->props->fb_blank = *(int *)evdata->data;
if (bd->props && bd->props->update_status)
bd->props->update_status(bd);
backlight_update_status(bd);
}
up(&bd->sem);
return 0;
@ -97,8 +96,7 @@ static ssize_t backlight_store_power(struct class_device *cdev, const char *buf,
if (bd->props) {
pr_debug("backlight: set power to %d\n", power);
bd->props->power = power;
if (bd->props->update_status)
bd->props->update_status(bd);
backlight_update_status(bd);
rc = count;
}
up(&bd->sem);
@ -140,8 +138,7 @@ static ssize_t backlight_store_brightness(struct class_device *cdev, const char
pr_debug("backlight: set brightness to %d\n",
brightness);
bd->props->brightness = brightness;
if (bd->props->update_status)
bd->props->update_status(bd);
backlight_update_status(bd);
rc = count;
}
}
@ -230,6 +227,7 @@ struct backlight_device *backlight_device_register(const char *name,
if (!new_bd)
return ERR_PTR(-ENOMEM);
mutex_init(&new_bd->update_lock);
init_MUTEX(&new_bd->sem);
new_bd->props = bp;
memset(&new_bd->class_dev, 0, sizeof(new_bd->class_dev));

1
drivers/video/backlight/lcd.c
View file

@ -198,6 +198,7 @@ struct lcd_device *lcd_device_register(const char *name, void *devdata,
return ERR_PTR(-ENOMEM);
init_MUTEX(&new_ld->sem);
mutex_init(&new_ld->update_lock);
new_ld->props = lp;
memset(&new_ld->class_dev, 0, sizeof(new_ld->class_dev));
new_ld->class_dev.class = &lcd_class;

8
drivers/video/chipsfb.c
View file

@ -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 */

6
drivers/video/nvidia/nv_backlight.c
View file

@ -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);

6
drivers/video/riva/fbdev.c
View file

@ -357,10 +357,8 @@ static void riva_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;
__riva_bl_update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
@ -397,11 +395,9 @@ static void riva_bl_init(struct riva_par *par)
FB_BACKLIGHT_MAX);
mutex_unlock(&info->bl_mutex);
down(&bd->sem);
bd->props->brightness = riva_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);