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media: v4l2-ioctl.c: don't copy back the result for -ENOTTY

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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>
Cc: <stable@vger.kernel.org>      # for v4.15 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2018-01-30 03:50:01 -05:00 committed by Mauro Carvalho Chehab
parent b2469c814f
commit 181a4a2d5a
1 changed files with 4 additions and 1 deletions
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5
drivers/media/v4l2-core/v4l2-ioctl.c
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@ -2900,8 +2900,11 @@ video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
/* Handles IOCTL */
err = func(file, cmd, parg);
if (err == -ENOIOCTLCMD)
if (err == -ENOTTY || err == -ENOIOCTLCMD) {
err = -ENOTTY;
goto out;
}
if (err == 0) {
if (cmd == VIDIOC_DQBUF)
trace_v4l2_dqbuf(video_devdata(file)->minor, parg);