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Imre Deak f4e1544ab8 drm/dp_mst: Verify request type in the corresponding down message reply
commit 4d49e77a97 upstream.

After receiving the response for an MST down request message, the
response should be accepted/parsed only if the response type matches
that of the request. Ensure this by checking if the request type code
stored both in the request and the reply match, dropping the reply in
case of a mismatch.

This fixes the topology detection for an MST hub, as described in the
Closes link below, where the hub sends an incorrect reply message after
a CLEAR_PAYLOAD_TABLE -> LINK_ADDRESS down request message sequence.

Cc: Lyude Paul <lyude@redhat.com>
Cc: <stable@vger.kernel.org>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12804
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241203160223.2926014-3-imre.deak@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-14 20:03:28 +01:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
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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
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the problems which may result by upgrading your kernel.