drm/dp_mst: Sanitize mgr->qlock locking in drm_dp_mst_wait_tx_reply()

Make the locking look symmetric with the unlocking.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200603211040.8190-2-imre.deak@intel.com

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index cb4140d..469d356 100644 (file)
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1183,7 +1183,7 @@ static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb,
        ret = wait_event_timeout(mgr->tx_waitq,
                                 check_txmsg_state(mgr, txmsg),
                                 (4 * HZ));
-       mutex_lock(&mstb->mgr->qlock);
+       mutex_lock(&mgr->qlock);
        if (ret > 0) {
                if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) {
                        ret = -EIO;