[PATCH] v4l: subdev: compat: update handling for VIDIOC_SUBDEV_[GS]_ROUTING

[Niklas Söderlund]

Implement compat IOCTL handling for VIDIOC_SUBDEV_G_ROUTING and
VIDIOC_SUBDEV_S_ROUTING IOCTLs.

Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Hi Sakari,

With this fix on-top of your vc branch I get it work with v4.16-rc1, 
feel free to squash it into your branch where appropriate. I tested this 
with a ARM64 kernel and a ARM user-land with v4l2-ctl + my 
--{get,set}-routing patches for v4l-utils.

// Niklas

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c 
b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index a1f71a83ac076d7f..30700658963d3227 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -1124,7 +1124,10 @@ static long do_video_ioctl(struct file *file, unsigned 
int cmd, unsigned long ar
 
        case VIDIOC_SUBDEV_G_ROUTING:
        case VIDIOC_SUBDEV_S_ROUTING:
-               err = get_v4l2_subdev_routing(&karg.subdev_routing, up);
+               err = alloc_userspace(sizeof(struct v4l2_subdev_routing),
+                                     0, &up_native);
+               if (!err)
+                       err = get_v4l2_subdev_routing(up_native, up);
                compatible_arg = 0;
                break;
 
@@ -1257,7 +1260,7 @@ static long do_video_ioctl(struct file *file, unsigned 
int cmd, unsigned long ar
                break;
        case VIDIOC_SUBDEV_G_ROUTING:
        case VIDIOC_SUBDEV_S_ROUTING:
-               err = put_v4l2_subdev_routing(&karg.subdev_routing, up);
+               err = put_v4l2_subdev_routing(up_native, up);
                break;
        }
        if (err)
-- 
2.16.1