backlight: blackfin - Fix missing registration failure handling

Check newly registered backlight_device for error and properly
return error to parent
Mark struct backlight_ops as const.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Mike Frysinger <vapier@gentoo.org> (constify struct backlight_ops)
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

2 files changed, 18 insertions, 2 deletions

diff --git a/drivers/video/bf54x-lq043fb.c b/drivers/video/bf54x-lq043fb.c
index 54df3d44af8f..23b2a8c0dbfc 100644
--- a/drivers/video/bf54x-lq043fb.c
+++ b/drivers/video/bf54x-lq043fb.c
@@ -433,7 +433,7 @@ static int bl_get_brightness(struct backlight_device *bd)
         return 0;
 }
 
-static struct backlight_ops bfin_lq043fb_bl_ops = {
+static const struct backlight_ops bfin_lq043fb_bl_ops = {
         .get_brightness = bl_get_brightness,
 };
 
@@ -650,6 +650,12 @@ static int __devinit bfin_bf54x_probe(struct platform_device *pdev)
         props.max_brightness = 255;
         bl_dev = backlight_device_register("bf54x-bl", NULL, NULL,
                                            &bfin_lq043fb_bl_ops, &props);
+        if (IS_ERR(bl_dev)) {
+                printk(KERN_ERR DRIVER_NAME
+                        ": unable to register backlight.\n");
+                ret = -EINVAL;
+                goto out9;
+        }
 
         lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
         lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
@@ -657,6 +663,8 @@ static int __devinit bfin_bf54x_probe(struct platform_device *pdev)
 
         return 0;
 
+out9:
+        unregister_framebuffer(fbinfo);
 out8:
         free_irq(info->irq, info);
 out7:
diff --git a/drivers/video/bfin-t350mcqb-fb.c b/drivers/video/bfin-t350mcqb-fb.c
index 3a8e811a7e9f..31a2dec927bb 100644
--- a/drivers/video/bfin-t350mcqb-fb.c
+++ b/drivers/video/bfin-t350mcqb-fb.c
@@ -352,7 +352,7 @@ static int bl_get_brightness(struct backlight_device *bd)
         return 0;
 }
 
-static struct backlight_ops bfin_lq043fb_bl_ops = {
+static const struct backlight_ops bfin_lq043fb_bl_ops = {
         .get_brightness = bl_get_brightness,
 };
 
@@ -545,6 +545,12 @@ static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
         props.max_brightness = 255;
         bl_dev = backlight_device_register("bf52x-bl", NULL, NULL,
                                            &bfin_lq043fb_bl_ops, &props);
+        if (IS_ERR(bl_dev)) {
+                printk(KERN_ERR DRIVER_NAME
+                        ": unable to register backlight.\n");
+                ret = -EINVAL;
+                goto out9;
+        }
 
         lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
         lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
@@ -552,6 +558,8 @@ static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
 
         return 0;
 
+out9:
+        unregister_framebuffer(fbinfo);
 out8:
         free_irq(info->irq, info);
 out7: