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DDI might be HDMI or DP only, leaving the other encoder uninitialized. Calling the shutdown hook on an uninitialized encoder may lead to a NULL pointer dereference. Check the encoder types (and thus validity via the DP output_reg or HDMI hdmi_reg checks) before calling the hooks. Reported-and-tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Closes: https://lore.kernel.org/r/20241031105145.2140590-1-senozhatsky@chromium.org Cc: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/8b197c50e7f3be2bbc07e3935b21e919815015d5.1735568047.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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.