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On shutdown the driver core calls the bus' shutdown callback also for unbound devices. A driver's shutdown callback however is only called for devices bound to this driver. Commit9c30921fe7("driver core: platform: use bus_type functions") changed the platform bus from driver callbacks to bus callbacks, so the shutdown function must be prepared to be called without a driver. Add the corresponding check in the shutdown function. Fixes:9c30921fe7("driver core: platform: use bus_type functions") Tested-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20201212235533.247537-1-dmitry.baryshkov@linaro.org 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.