The patch titled
backlight: fix oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/*
has been added to the -mm tree. Its filename is
backlight-fix-oops-in-__mutex_lock_slowpath-during-head-sys-class-graphics-fb0.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: backlight: fix oops in __mutex_lock_slowpath during head /sys/class/graphics/fb0/*
From: Michael Hanselmann <linux-kernel@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Olaf Hering <olaf@xxxxxxxxx>
Cc: "Antonino A. Daplas" <adaplas@xxxxxxx>
Cc: Daniel R Thompson <daniel.thompson@xxxxxx>
Cc: Jon Smirl <jonsmirl@xxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/video/fbsysfs.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff -puN drivers/video/fbsysfs.c~backlight-fix-oops-in-__mutex_lock_slowpath-during-head-sys-class-graphics-fb0 drivers/video/fbsysfs.c
--- a/drivers/video/fbsysfs.c~backlight-fix-oops-in-__mutex_lock_slowpath-during-head-sys-class-graphics-fb0
+++ a/drivers/video/fbsysfs.c
@@ -397,6 +397,12 @@ static ssize_t store_bl_curve(struct cla
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 clas
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,
_
Patches currently in -mm which might be from linux-kernel@xxxxxxxxx are
backlight-fix-oops-in-__mutex_lock_slowpath-during-head-sys-class-graphics-fb0.patch
apple-motion-sensor-driver-2.patch
apple-motion-sensor-driver-2-fixes-update.patch
apple-motion-sensor-driver-kconfig-fix.patch
ams-check-return-values-from-device_create_file.patch
-
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