media: v4l2-compat-ioctl32.c: add missing VIDIOC_PREPARE_BUF

The result of the VIDIOC_PREPARE_BUF ioctl was never copied back
to userspace since it was missing in the switch.

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>

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index e48d590..76ed43e 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -1052,6 +1052,7 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
                err = put_v4l2_create32(&karg.v2crt, up);
                break;
 
+       case VIDIOC_PREPARE_BUF:
        case VIDIOC_QUERYBUF:
        case VIDIOC_QBUF:
        case VIDIOC_DQBUF: