From: Hans Verkuil Date: Fri, 26 Jan 2018 08:24:53 +0000 (-0500) Subject: media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d83a8243aaefe62ace433e4384a4f077bed86acb;p=openwrt%2Fstaging%2Fblogic.git media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors Some ioctls need to copy back the result even if the ioctl returned an error. However, don't do this for the error code -ENOTTY. It makes no sense in that cases. Signed-off-by: Hans Verkuil Acked-by: Sakari Ailus Cc: # for v4.15 and up Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index 7ee3777cbe9c..3a1fca1440ac 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -968,6 +968,9 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar set_fs(old_fs); } + if (err == -ENOTTY) + return err; + /* Special case: even after an error we need to put the results back for these ioctls since the error_idx will contain information on which control failed. */