After an error during receiving a packet for a multi-packet DP MST sideband message, the state tracking which packets have been received already is not reset. This prevents the reception of subsequent down messages (due to the pending message not yet completed with an end-of-message-transfer packet).
Fix the above by resetting the reception state after a packet error.
Cc: Lyude Paul lyude@redhat.com Cc: stable@vger.kernel.org # v3.17+ Signed-off-by: Imre Deak imre.deak@intel.com --- drivers/gpu/drm/display/drm_dp_mst_topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 90819fff2c9ba..01350510244f2 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3856,7 +3856,7 @@ static int drm_dp_mst_handle_down_rep(struct drm_dp_mst_topology_mgr *mgr) struct drm_dp_sideband_msg_rx *msg = &mgr->down_rep_recv;
if (!drm_dp_get_one_sb_msg(mgr, false, &mstb)) - goto out; + goto out_clear_reply;
/* Multi-packet message transmission, don't clear the reply */ if (!msg->have_eomt)