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Subject[PATCH 3.2 127/140] media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
3.2.100-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hans Verkuil <hverkuil@xs4all.nl>

From: Hans Verkuil <hans.verkuil@cisco.com>

commit 181a4a2d5a0a7b43cab08a70710d727e7764ccdd upstream.

If the ioctl returned -ENOTTY, then don't bother copying
back the result as there is no point.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/media/video/v4l2-ioctl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 639abeee3392..bae5dd776d82 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -2308,8 +2308,10 @@ video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,

/* Handles IOCTL */
err = func(file, cmd, parg);
- if (err == -ENOIOCTLCMD)
- err = -EINVAL;
+ if (err == -ENOTTY || err == -ENOIOCTLCMD) {
+ err = -ENOTTY;
+ goto out;
+ }

if (has_array_args) {
*kernel_ptr = user_ptr;
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