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Function 'devm_gpiod_get_index_optional' returns NULL if the descriptor is invalid and the error associated for the error pointer is ENOENT. Sometimes if the pin is just assigned the error associated for the pointer might not be ENOENT but other. In order to avoid weirds behaviours if this happen set descriptor to NULL in the driver port structure. Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Link: https://lore.kernel.org/r/20200320110123.9907-6-sergio.paracuellos@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.