8ac1714015
Some recent changes at V4L2 core changed the way querycap is handled. Due to that, this warning is generated: WARNING: CPU: 1 PID: 503 at drivers/media/v4l2-core/v4l2-dev.c:885 __video_register_device+0x93e/0x1120 [videodev] as introduced by this commit: commit 3c1350501c21db8e3b1a38d9e97db29694305c3b Author: Hans Verkuil <hverkuil-cisco@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. The fix is simple: we just need to initialize dev_caps before registering the V4L2 dev. While here, solve other problems at VIDIOC_QUERYCAP ioctl. Reported-by: Patrik Gfeller <patrik.gfeller@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.