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c780d01cf1
Add two new checks: 1) wait_prepare and wait_finish callbacks are either both present or both unset, you can't mix. 2) if lock == NULL, then wait_prepare (and due to check 1 also wait_finish) must be present. These checks should prevent the case where lock == NULL, but there is no way to release/reacquire whatever lock is used when waiting for a buffer to arrive in VIDIOC_DQBUF. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> 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 reStructuredText 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.