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A commit 3a93d082ba ("ALSA: firewire-motu: add support for MOTU Audio
Express") describes a quirk of MOTU Audio Express. The device returns
acknowledge packet with 0x10 as the pending state of any types of
asynchronous request transaction. It is completely out of specification.
This commit implements handling for that device-specific quirk. The quirk
is detected after reading the root directory of configuration ROM. When
processing the acknowledge code in 1394 OHCI AT context event handler,
firewire-ohci module seeks the device instance of destination node by
traversing device hierarchy. If the device has the quirk, the acknowledge
code is replaced with the standard code.
The 1394 OHCI AT context events occur for outgoing asynchronous request
packets. The device traversal is safe since no new request initiators
exist after the fw_card_instance has been invalidated.
Link: https://lore.kernel.org/r/20251013140311.97159-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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 reStructuredText 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.