c6837aa180
After assigning chip = pwm->chip; the compiler is free to assume that pwm is non-NULL and so can optimize out the check for pwm against NULL. While it's probably a programming error to pass a NULL pointer to pwm_put() this shouldn't be dropped without careful consideration and wasn't intended. So assign chip only after the NULL check. Reported-by: David Lechner <dlechner@baylibre.com> Link: https://lore.kernel.org/r/66a6f562-1fdd-4e45-995a-e7995432aa0c@baylibre.com Fixes: 4c56b1434b81 ("pwm: Add a struct device to struct pwm_chip") Link: https://lore.kernel.org/r/20240329101648.544155-2-u.kleine-koenig@pengutronix.de Reviewed-by: David Lechner <dlechner@baylibre.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.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.