On Tue, Oct 25, 2022 at 05:41:02PM +0300, Ovidiu Panait wrote:
From: Chen-Yu Tsai wenst@chromium.org
commit 8310ca94075e784bbb06593cd6c068ee6b6e4ca6 upstream.
DST_QUEUE_OFF_BASE is applied to offset/mem_offset on MMAP capture buffers only for the VIDIOC_QUERYBUF ioctl, while the userspace fields (including offset/mem_offset) are filled in for VIDIOC_{QUERY,PREPARE,Q,DQ}BUF ioctls. This leads to differences in the values presented to userspace. If userspace attempts to mmap the capture buffer directly using values from DQBUF, it will fail.
Move the code that applies the magic offset into a helper, and call that helper from all four ioctl entry points.
[hverkuil: drop unnecessary '= 0' in v4l2_m2m_querybuf() for ret]
Fixes: 7f98639def42 ("V4L/DVB: add memory-to-memory device helper framework for videobuf") Fixes: 908a0d7c588e ("[media] v4l: mem2mem: port to videobuf2") Signed-off-by: Chen-Yu Tsai wenst@chromium.org Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org [OP: adjusted return logic for 4.14] Signed-off-by: Ovidiu Panait ovidiu.panait@windriver.com
All now queued up, thanks.
greg k-h