[media] v4l2-ioctl: fix incorrect error code if VIDIOC_DBG_G/S_REGISTER are unsupported

The ioctls VIDIOC_DBG_S_REGISTER and VIDIOC_DBG_G_REGISTER should return -EINVAL
if the driver didn't implement them. Currently they return -EPERM if called as
non-root user. However, this check should only be done if the driver actually
implemented these ioctls. Otherwise, just return -EINVAL as we do with all
unimplemented ioctls.

This bug make the v4l2-compliance test suite fail.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index 7e47f15..f51327e 100644 (file)
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -1659,20 +1659,24 @@ static long __video_do_ioctl(struct file *file,
        {
                struct v4l2_dbg_register *p = arg;
 
-               if (!capable(CAP_SYS_ADMIN))
-                       ret = -EPERM;
-               else if (ops->vidioc_g_register)
-                       ret = ops->vidioc_g_register(file, fh, p);
+               if (ops->vidioc_g_register) {
+                       if (!capable(CAP_SYS_ADMIN))
+                               ret = -EPERM;
+                       else
+                               ret = ops->vidioc_g_register(file, fh, p);
+               }
                break;
        }
        case VIDIOC_DBG_S_REGISTER:
        {
                struct v4l2_dbg_register *p = arg;
 
-               if (!capable(CAP_SYS_ADMIN))
-                       ret = -EPERM;
-               else if (ops->vidioc_s_register)
-                       ret = ops->vidioc_s_register(file, fh, p);
+               if (ops->vidioc_s_register) {
+                       if (!capable(CAP_SYS_ADMIN))
+                               ret = -EPERM;
+                       else
+                               ret = ops->vidioc_s_register(file, fh, p);
+               }
                break;
        }
 #endif