The kernel check was added in [1] v5.4-rc1 by:
Author: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Date: Tue Jul 23 04:21:25 2019 -0400
media: v4l2-dev/ioctl: require non-zero device_caps, verify sane querycap
results
Now that all V4L2 drivers set device_caps in struct video_device, we can add
a check for this to ensure all future drivers fill this in.
Also verify that when the querycap ioctl is called the driver didn't mess
with the device_caps value and that capabilities is a superset of
device_caps.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Reviewed-by: Sakari Ailus <sakari.ai...@linux.intel.com>
[hverkuil-ci...@xs4all.nl: fix too-long line]
Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3c1350501c21db8e3b1a38d9e97db29694305c3b
** Patch added: "v2: clarify why upstreaming is not needed"
https://bugs.launchpad.net/ubuntu/+source/v4l2loopback/+bug/1899633/+attachment/5424119/+files/focal-proposed-fix.debdiff
** Patch removed: "focal-proposed-fix.debdiff"
https://bugs.launchpad.net/ubuntu/+source/v4l2loopback/+bug/1899633/+attachment/5421730/+files/focal-proposed-fix.debdiff
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https://bugs.launchpad.net/bugs/1899633
Title:
Repeated kernel warnings/stacktraces with kernel 5.4 and newer
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