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[ Upstream commit3793301cba] A CAN XL device is always capable to process CAN FD frames. The former check when sending CAN FD frames relied on the existence of a CAN FD device and did not check for a CAN XL device that would be correct too. With this patch the CAN FD feature is enabled automatically when CAN XL is switched on - and CAN FD cannot be switch off while CAN XL is enabled. This precondition also leads to a clean up and reduction of checks in the hot path in raw_rcv() and raw_sendmsg(). Some conditions are reordered to handle simple checks first. changes since v1: https://lore.kernel.org/all/20230131091012.50553-1-socketcan@hartkopp.net - fixed typo: devive -> device changes since v2: https://lore.kernel.org/all/20230131091824.51026-1-socketcan@hartkopp.net/ - reorder checks in if statements to handle simple checks first Fixes:626332696d("can: raw: add CAN XL support") Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://lore.kernel.org/all/20230131105613.55228-1-socketcan@hartkopp.net 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.