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Sudeep Holla authored
The bus probe callback calls the driver callback without further
checking. Better be safe than sorry and refuse registration of a driver
without a probe function to prevent a NULL pointer exception.

Link: https://lore.kernel.org/r/20210624095059.4010157-2-sudeep.holla@arm.com
Fixes: 933c5044

 ("firmware: arm_scmi: add scmi protocol bus to enumerate protocol devices")
Reported-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: default avatarCristian Marussi <cristian.marussi@arm.com>
Reviewed-by: default avatarCristian Marussi <cristian.marussi@arm.com>
Acked-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarSudeep Holla <sudeep.holla@arm.com>
5e469dac
Forked from BeagleBoard.org / Linux
295919 commits behind the upstream repository.
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.