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In the following 4 patches |99842c9685can: dev: can_rx_offload_get_echo_skb(): extend to return can frame length |9420e1d495can: dev: can_get_echo_skb(): extend to return can frame length |1dcb6e57dbcan: dev: can_put_echo_skb(): extend to handle frame_len |f0ef72febccan: dev: extend struct can_skb_priv to hold CAN frame length the CAN echo SKB support was extended to hold the CAN frame length (which is the length of the CAN frame on the wire). It is meant as a helper for BQL support, to avoid the re-calculation of the frame length before sending it and on TX-completion. However if the CAN frame is send without the request to be looped back the SKB is discarded in can_put_echo_skb() and the subsequent can_get_echo_skb() and can_rx_offload_get_echo_skb() return 0 for the CAN frame length. This results in BQL stalling the TX queue after a few packages. Until the BQL helpers can_get_echo_skb() and can_rx_offload_get_echo_skb() are fixed, revert the BQL support for the mcp251xfd driver. This reverts commit4162e18e94. Fixes:4162e18e94("can: mcp251xfd: add BQL support") Cc: Manivannan Sadhasivam <mani@kernel.org> Cc: Thomas Kopp <thomas.kopp@microchip.com> Link: https://lore.kernel.org/r/20210228083347.28580-1-mkl@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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.