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  1. Jun 29, 2015
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  3. Jun 25, 2015
    • Dave Airlie's avatar
      drm/dp/mst: close deadlock in connector destruction. · 6b8eeca6
      Dave Airlie authored
      
      
      I've only seen this once, and I failed to capture the
      lockdep backtrace, but I did some investigations.
      
      If we are calling into the MST layer from EDID probing,
      we have the mode_config mutex held, if during that EDID
      probing, the MST hub goes away, then we can get a deadlock
      where the connector destruction function in the driver
      tries to retake the mode config mutex.
      
      This offloads connector destruction to a workqueue,
      and avoid the subsequenct lock ordering issue.
      
      Acked-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      6b8eeca6
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