b240ae79e4e2788e1be0e21f2056532eb1db6a15

DP MST driver registers bridge callback functions with the DRM framework. mst_lock is used for synchronization of the mst bridge functions. These functions call into dp_display where a session lock is obtained for the display. HPD callbacks, on the other hand, are first handled by dp_display. During these callbacks, dp_display takes a session lock first before calling into DP MST driver layer. Currently, the DP MST layer waits on mst_lock which can result in a deadlock. This change removes the usage of mst_lock inside hpd callback functions and just uses the session lock for synchronization. Change-Id: I7ec338004eef43ac0f1e1f092463e9915cd60684 Signed-off-by: Rajkumar Subbiah <rsubbia@codeaurora.org>
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