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91edf5a0c2
A trb_in_td() call is used to determine if a completion event matches any TRB of the currently executing TD. This function is told to start searching right after the last finished TD, which is not at all where the currently expected TD is guaranteed to begin, because some TDs in between may have been cancelled. Not only is a pointless work performed, but a bug resulting in the HC executing cancelled TDs was seen to trick the driver into associating events from a TD just cancelled with an unrelated future TD. Since the ring is being traversed for the specific purpose of finding a match with the current TD, always start from its first TRB. This is the most reliable bit of information that we posses. Tracking of HC's work progress is not affected, except for cases when a misattributed event would have moved dequeue past a pending TD. Signed-off-by: Michal Pecio <michal.pecio@gmail.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20240229141438.619372-7-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.