backlight: fix oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/*

Seems like not all drivers use the framebuffer_alloc() function and won't
have an initialized mutex.  But those don't have a backlight, anyway.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Cc: Olaf Hering <olaf@aepfle.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Daniel R Thompson <daniel.thompson@st.com>
Cc: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/video/fbsysfs.c b/drivers/video/fbsysfs.c
index 4f78f234473d78ca36a25b0e34239ea052aedac0..c151dcf68786a1c5ca1987f209e83351db5159d7 100644 (file)
--- 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,