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Andy Chiu says: ==================== net: axienet: fix DMA Tx error We ran into multiple DMA TX errors while writing files over a network block device running on top of a DMA-connected AXI Ethernet device on 64-bit RISC-V machines. The errors indicated that the DMA had fetched a null descriptor and we found that the reason for this is that AXI DMA had unexpectedly processed a partially updated tail descriptor pointer. To fix it, we suggest that the driver should use one 64-bit write instead of two 32-bit writes to perform such update if possible. For those archectures where double-word load/stores are unavailable, e.g. 32-bit archectures, force a driver probe failure if the driver finds 64-bit capability on DMA. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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.