1 files changed, 8 insertions, 21 deletions

diff --git a/drivers/video/aty/radeon_backlight.c b/drivers/video/aty/radeon_backlight.c
index 9cfcecac8b5e..f94e4616788d 100644
--- a/drivers/video/aty/radeon_backlight.c
+++ b/drivers/video/aty/radeon_backlight.c
@@ -29,17 +29,13 @@ struct radeon_bl_privdata {
 static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
                 int level)
 {
-        struct fb_info *info = pdata->rinfo->info;
         int rlevel;
 
-        mutex_lock(&info->bl_mutex);
-
         /* Get and convert the value */
+        /* No locking of bl_curve since we read a single value */
         rlevel = pdata->rinfo->info->bl_curve[level] *
                  FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
 
-        mutex_unlock(&info->bl_mutex);
-
         if (rlevel < 0)
                 rlevel = 0;
         else if (rlevel > MAX_RADEON_LEVEL)
@@ -187,12 +183,10 @@ void radeonfb_bl_init(struct radeonfb_info *rinfo)
                 machine_is_compatible("PowerBook6,5");
 #endif
 
-        mutex_lock(&rinfo->info->bl_mutex);
         rinfo->info->bl_dev = bd;
         fb_bl_default_curve(rinfo->info, 0,
                  63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
                 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
-        mutex_unlock(&rinfo->info->bl_mutex);
 
         bd->props->brightness = radeon_bl_data.max_brightness;
         bd->props->power = FB_BLANK_UNBLANK;
@@ -216,29 +210,22 @@ error:
 
 void radeonfb_bl_exit(struct radeonfb_info *rinfo)
 {
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_lock(&pmac_backlight_mutex);
-#endif
+        struct backlight_device *bd = rinfo->info->bl_dev;
 
-        mutex_lock(&rinfo->info->bl_mutex);
-        if (rinfo->info->bl_dev) {
+        if (bd) {
                 struct radeon_bl_privdata *pdata;
 
 #ifdef CONFIG_PMAC_BACKLIGHT
-                if (pmac_backlight == rinfo->info->bl_dev)
+                mutex_lock(&pmac_backlight_mutex);
+                if (pmac_backlight == bd)
                         pmac_backlight = NULL;
+                mutex_unlock(&pmac_backlight_mutex);
 #endif
-
-                pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
-                backlight_device_unregister(rinfo->info->bl_dev);
+                pdata = class_get_devdata(&bd->class_dev);
+                backlight_device_unregister(bd);
                 kfree(pdata);
                 rinfo->info->bl_dev = NULL;
 
                 printk("radeonfb: Backlight unloaded\n");
         }
-        mutex_unlock(&rinfo->info->bl_mutex);
-
-#ifdef CONFIG_PMAC_BACKLIGHT
-        mutex_unlock(&pmac_backlight_mutex);
-#endif
 }