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[ Upstream commit d0b06dc48fb15902d7da09c5c0861e7f042a9381 ] When resetting the bus after a gap count error, use a long rather than short bus reset. IEEE 1394-1995 uses only long bus resets. IEEE 1394a adds the option of short bus resets. When video or audio transmission is in progress and a device is hot-plugged elsewhere on the bus, the resulting bus reset can cause video frame drops or audio dropouts. Short bus resets reduce or eliminate this problem. Accordingly, short bus resets are almost always preferred. However, on a mixed 1394/1394a bus, a short bus reset can trigger an immediate additional bus reset. This double bus reset can be interpreted differently by different nodes on the bus, resulting in an inconsistent gap count after the bus reset. An inconsistent gap count will cause another bus reset, leading to a neverending bus reset loop. This only happens for some bus topologies, not for all mixed 1394/1394a buses. By instead sending a long bus reset after a gap count inconsistency, we avoid the doubled bus reset, restoring the bus to normal operation. Signed-off-by: Adam Goldman <adamg@pobox.com> Link: https://sourceforge.net/p/linux1394/mailman/message/58741624/ Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Sasha Levin <sashal@kernel.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.