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backlight: Convert semaphore -> mutex

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Convert internal semaphore to a mutex

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Richard Purdie
2007-02-08 22:53:55 +00:00
parent 28ee086d5b
commit 249040dc7f
4 changed files with 37 additions and 37 deletions
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34
drivers/video/backlight/backlight.c
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@@ -32,14 +32,14 @@ static int fb_notifier_callback(struct notifier_block *self,
return 0;
bd = container_of(self, struct backlight_device, fb_notif);
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props)
if (!bd->props->check_fb ||
bd->props->check_fb(evdata->info)) {
bd->props->fb_blank = *(int *)evdata->data;
backlight_update_status(bd);
}
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return 0;
}
@@ -71,10 +71,10 @@ static ssize_t backlight_show_power(struct class_device *cdev, char *buf)
int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props)
rc = sprintf(buf, "%d\n", bd->props->power);
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -92,14 +92,14 @@ static ssize_t backlight_store_power(struct class_device *cdev, const char *buf,
if (size != count)
return -EINVAL;
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props) {
pr_debug("backlight: set power to %d\n", power);
bd->props->power = power;
backlight_update_status(bd);
rc = count;
}
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -109,10 +109,10 @@ static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props)
rc = sprintf(buf, "%d\n", bd->props->brightness);
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -130,7 +130,7 @@ static ssize_t backlight_store_brightness(struct class_device *cdev, const char
if (size != count)
return -EINVAL;
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props) {
if (brightness > bd->props->max_brightness)
rc = -EINVAL;
@@ -142,7 +142,7 @@ static ssize_t backlight_store_brightness(struct class_device *cdev, const char
rc = count;
}
}
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -152,10 +152,10 @@ static ssize_t backlight_show_max_brightness(struct class_device *cdev, char *bu
int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props)
rc = sprintf(buf, "%d\n", bd->props->max_brightness);
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -166,10 +166,10 @@ static ssize_t backlight_show_actual_brightness(struct class_device *cdev,
int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(cdev);
down(&bd->sem);
mutex_lock(&bd->props_lock);
if (bd->props && bd->props->get_brightness)
rc = sprintf(buf, "%d\n", bd->props->get_brightness(bd));
up(&bd->sem);
mutex_unlock(&bd->props_lock);
return rc;
}
@@ -228,7 +228,7 @@ struct backlight_device *backlight_device_register(const char *name,
return ERR_PTR(-ENOMEM);
mutex_init(&new_bd->update_lock);
init_MUTEX(&new_bd->sem);
mutex_init(&new_bd->props_lock);
new_bd->props = bp;
memset(&new_bd->class_dev, 0, sizeof(new_bd->class_dev));
new_bd->class_dev.class = &backlight_class;
@@ -285,9 +285,9 @@ void backlight_device_unregister(struct backlight_device *bd)
class_device_remove_file(&bd->class_dev,
&bl_class_device_attributes[i]);
down(&bd->sem);
mutex_lock(&bd->props_lock);
bd->props = NULL;
up(&bd->sem);
mutex_unlock(&bd->props_lock);
backlight_unregister_fb(bd);