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'mlock' was being grabbed when setting the device frequency. In order to not introduce any functional change a new lock is added. With that in mind, the lock also needs to be grabbed in the places where 'mlock' is since it was also being used to protect st->config against the current device state. On the other places the lock was being used, we can just drop it since we are only doing one i2c bus read/write which is already safe. While at it, properly include "mutex.h" for mutex related APIs. Signed-off-by: Nuno Sá <nuno.sa@analog.com> Link: https://lore.kernel.org/r/20221004134909.1692021-2-nuno.sa@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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.