Hi,

Hans V. I've tested your patch for avoiding the double
conversion problem, and I can report it fixes the issue seen with
webcameras which need 90 degrees rotation.

While testing I found a bug in gspca, which gets triggered by
qv4l2 which makes it impossible to switch between userptr and
mmap mode. While fixing that I also found some locking issues in
gspca. As these all touch the gscpa core I'll send a patch set
to Jean Francois Moine for this.

With the issues in gspca fixed, I found a bug in qv4l2 when using
read mode in raw mode (not passing the correct src_size to
libv4lconvert_convert).

I've attached 2 patches to qv4l2, fixing the read issue and a similar
issue in mmap / userptr mode. These apply on top of your patch.

Regards,

Hans