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04d21f7219
xhci driver links together segments in a ring buffer by turning the last TRB of a segment into a link TRB, pointing to the beginning of the next segment. If the first TRB of every segment for some unknown reason is a link TRB pointing to the next segment, then prepare_ring() loops indefinitely. This isn't something the xhci driver would do. xHC hardware has access to these rings, it sholdn't be writing link TRBs either, but with broken xHC hardware this could in theory be possible. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20210129130044.206855-10-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.