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2e43aae2bf
It seems that many UAC2 devices are with the implicit feedback, but they couldn't be probed properly because the assumption the driver takes currently isn't applied: they have the single endpoint for both data and implicit-fb streams, while we checked only the classical sync endpoints assigned to the next altsetting in the same interface. This patch extends the search to match with those typical cases where the implicit fb stream is found in the next interface number. While we're at it, slightly refactor the code, not returning 0/-ERROR but use the standard bool to success/failur, which is more intuitive in this particular case. Reported-by: Dylan Robinson <dylan_robinson@motu.com> Tested-by: Keith Milner <kamilner@superlative.org> Tested-by: Dylan Robinson <dylan_robinson@motu.com> Link: https://lore.kernel.org/r/20201123085347.19667-5-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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.