8b8a688260
commit 6bdeff12a96c9a5da95c8d11fefd145eb165e32a upstream. Some old ASICs might not implement/require get_dig_frontend helper; in this scenario, we can have a NULL pointer exception when we try to call it inside vbios disable operation. For example, this situation might happen when using Polaris12 with an eDP panel. This commit avoids this situation by adding a specific get_dig_frontend implementation for DCEx. Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Harry Wentland <Harry.Wentland@amd.com> Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Cc: Chiawen Huang <chiawen.huang@amd.com> Reported-and-tested-by: Borislav Petkov <bp@suse.de> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.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.