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The volatile attribute of control element means that the hardware can voluntarily change the state of control element independent of any operation by software. ALSA control core necessarily sends notification to userspace subscribers for any change from userspace application, while it doesn't for the hardware's voluntary change. This commit adds optimization for the attribute. Even if read value is different from written value, the test reports success as long as the target control element has the attribute. On the other hand, the difference is itself reported for developers' convenience. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/Ya7TAHdMe9i41bsC@workstation [Fix comment style as suggested by Shuah -- broonie] Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20211210185410.740009-3-broonie@kernel.org 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.