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87625b2498
This change adds a mutex to serialize accesses of sysfs attributes. This is required when polling CVRF bit of the MASK/ENABLE register because this bit is cleared on a read of this MASK/ENABLE register or a write to CONFIG register, which means that this bit might be accidentally cleared by reading other fields like alert flags. So this patch adds a mutex lock to protect the write() and read() callbacks. The read_string() callback won't need the lock since it just returns the label without touching any hardware register. Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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.