1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 4f78f234473d..c151dcf68786 100644
--- a/drivers/video/fbsysfs.c
+++ b/drivers/video/fbsysfs.c
@@ -397,6 +397,12 @@ static ssize_t store_bl_curve(struct class_device *class_device,
         u8 tmp_curve[FB_BACKLIGHT_LEVELS];
         unsigned int i;
 
+        /* Some drivers don't use framebuffer_alloc(), but those also
+         * don't have backlights.
+         */
+        if (!fb_info || !fb_info->bl_dev)
+                return -ENODEV;
+
         if (count != (FB_BACKLIGHT_LEVELS / 8 * 24))
                 return -EINVAL;
 
@@ -430,6 +436,12 @@ static ssize_t show_bl_curve(struct class_device *class_device, char *buf)
         ssize_t len = 0;
         unsigned int i;
 
+        /* Some drivers don't use framebuffer_alloc(), but those also
+         * don't have backlights.
+         */
+        if (!fb_info || !fb_info->bl_dev)
+                return -ENODEV;
+
         mutex_lock(&fb_info->bl_mutex);
         for (i = 0; i < FB_BACKLIGHT_LEVELS; i += 8)
                 len += snprintf(&buf[len], PAGE_SIZE,