diff --git a/msm/sde/sde_encoder_phys_cmd.c b/msm/sde/sde_encoder_phys_cmd.c
index fe2af2422a19..b5bdddf33296 100644
--- a/msm/sde/sde_encoder_phys_cmd.c
+++ b/msm/sde/sde_encoder_phys_cmd.c
@@ -538,12 +538,14 @@ static int _sde_encoder_phys_cmd_handle_ppdone_timeout(
 				pending_kickoff_cnt);
 
 		SDE_EVT32(DRMID(phys_enc->parent), SDE_EVTLOG_FATAL);
+		mutex_lock(phys_enc->vblank_ctl_lock);
 		sde_encoder_helper_unregister_irq(phys_enc, INTR_IDX_RDPTR);
 		if (sde_kms_is_secure_session_inprogress(phys_enc->sde_kms))
 			SDE_DBG_DUMP("secure", "all", "dbg_bus");
 		else
 			SDE_DBG_DUMP("all", "dbg_bus", "vbif_dbg_bus");
 		sde_encoder_helper_register_irq(phys_enc, INTR_IDX_RDPTR);
+		mutex_unlock(phys_enc->vblank_ctl_lock);
 	}
 
 	/*