diff options
| -rw-r--r-- | drivers/video/backlight/lcd.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c index a5d0d024bb9..34fb6bd798c 100644 --- a/drivers/video/backlight/lcd.c +++ b/drivers/video/backlight/lcd.c @@ -108,7 +108,7 @@ static ssize_t lcd_show_power(struct device *dev, struct device_attribute *attr, static ssize_t lcd_store_power(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - int rc = -ENXIO; + int rc; struct lcd_device *ld = to_lcd_device(dev); unsigned long power; @@ -116,6 +116,8 @@ static ssize_t lcd_store_power(struct device *dev, if (rc) return rc; + rc = -ENXIO; + mutex_lock(&ld->ops_lock); if (ld->ops && ld->ops->set_power) { pr_debug("set power to %lu\n", power); @@ -144,7 +146,7 @@ static ssize_t lcd_show_contrast(struct device *dev, static ssize_t lcd_store_contrast(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - int rc = -ENXIO; + int rc; struct lcd_device *ld = to_lcd_device(dev); unsigned long contrast; @@ -152,6 +154,8 @@ static ssize_t lcd_store_contrast(struct device *dev, if (rc) return rc; + rc = -ENXIO; + mutex_lock(&ld->ops_lock); if (ld->ops && ld->ops->set_contrast) { pr_debug("set contrast to %lu\n", contrast); |