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Laurent Pinchart
3662b54c16
The v4l2_m2m_get_vq() never returns a NULL pointer, as the internal get_queue_ctx() helper always returns a non-NULL pointer. Many drivers check the return value against NULL, due to a combination of old code and cargo-cult programming. Even v4l2-mem2mem.c contains unneeded NULL checks. Clarify the API by documenting explicitly that a NULL check is not needed, and simplify the code by removing the unneeded NULL checks from v4l2-mem2mem.c. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@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.