-stable review patch. If anyone has any objections, please let us know.
------------------
From: Michael Hanselmann <[email protected]>
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 <[email protected]>
Cc: Olaf Hering <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Cc: Daniel R Thompson <[email protected]>
Cc: Jon Smirl <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/video/fbsysfs.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- linux-2.6.18.orig/drivers/video/fbsysfs.c
+++ linux-2.6.18/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,
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
