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f406005e16
During initialisation of Focusrite USB audio interfaces, -EPROTO is sometimes returned from usb_set_interface(), which sometimes prevents the device from working: subsequent usb_set_interface() and uac_clock_source_is_valid() calls fail. This patch adds up to 5 retries in endpoint_set_interface(), with a delay starting at 5ms and doubling each time. 5 retries was chosen to allow for longer than expected waits for the interface to start responding correctly; in testing, a single 5ms delay was sufficient to fix the issue. Closes: https://github.com/geoffreybennett/fcp-support/issues/2 Cc: stable@vger.kernel.org Signed-off-by: Geoffrey D. Bennett <g@b4.vu> Link: https://patch.msgid.link/Z//7s9dKsmVxHzY2@m.b4.vu 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 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.