drm/mst: Fix error handling during MST sideband message reception
Handle any error due to partial reads, timeouts etc. to avoid parsing uninitialized data subsequently. Also bail out if the parsing itself fails. Cc: Dave Airlie <airlied@redhat.com> Cc: Lyude <lyude@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NImre Deak <imre.deak@intel.com> Reviewed-by: NLyude <lyude@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20170719114330.26540-2-imre.deak@intel.com
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