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[ Upstream commit d49184b7b585f9da7ee546b744525f62117019f6 ] This is a preparation patch. Sending the UINC messages followed by incrementing the tail pointer will be called in more than one place in upcoming patches, so factor this out into a separate function. Also make mcp251xfd_handle_rxif_ring_uinc() safe to be called with a "len" of 0. Tested-by: Stefan Althöfer <Stefan.Althoefer@janztec.com> Tested-by: Thomas Kopp <thomas.kopp@microchip.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Sasha Levin <sashal@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.