backlight: Rework backlight/fb interaction simplifying, lots

fb_info->bl_mutex is badly thought out and the backlight class doesn't
need it if the framebuffer/backlight register/unregister order is
consistent, particularly after the backlight locking fixes.

Fix the drivers to use the order:

backlight_device_register()
register_framebuffer()
unregister_framebuffer()
backlight_device_unregister()

and turn bl_mutex into a lock for the bl_curve data only.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c
index 64f59119c422..c18e9557ca30 100644
--- a/drivers/video/nvidia/nvidia.c
+++ b/drivers/video/nvidia/nvidia.c
@@ -1350,9 +1350,10 @@ static void __devexit nvidiafb_remove(struct pci_dev *pd)
 
         NVTRACE_ENTER();
 
+        unregister_framebuffer(info);
+
         nvidia_bl_exit(par);
 
-        unregister_framebuffer(info);
 #ifdef CONFIG_MTRR
         if (par->mtrr.vram_valid)
                 mtrr_del(par->mtrr.vram, info->fix.smem_start,