[PATCH RESEND v3 5/5] drm/dp_mst: Stop unsetting mstc->port, check connector registration

[Lyude Paul <lyude@xxxxxxxxxx>]

Same thing we did in i915, but for nouveau now.

Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 0469ef9e1a54..ff04a56b5949 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -698,8 +698,10 @@ nv50_msto_cleanup(struct nv50_msto *msto)
 	struct nv50_mstm *mstm = mstc->mstm;
 
 	NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name);
-	if (mstc->port && mstc->port->vcpi.vcpi > 0 && !nv50_msto_payload(msto))
+	if (!drm_connector_is_unregistered(&mstc->connector) &&
+	    mstc->port->vcpi.vcpi > 0 && !nv50_msto_payload(msto))
 		drm_dp_mst_deallocate_vcpi(&mstm->mgr, mstc->port);
+
 	if (msto->disabled) {
 		msto->mstc = NULL;
 		msto->head = NULL;
@@ -725,7 +727,8 @@ nv50_msto_prepare(struct nv50_msto *msto)
 	};
 
 	NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name);
-	if (mstc->port && mstc->port->vcpi.vcpi > 0) {
+	if (!drm_connector_is_unregistered(&mstc->connector) &&
+	    mstc->port->vcpi.vcpi > 0) {
 		struct drm_dp_payload *payload = nv50_msto_payload(msto);
 		if (payload) {
 			args.vcpi.start_slot = payload->start_slot;
@@ -828,7 +831,7 @@ nv50_msto_disable(struct drm_encoder *encoder)
 	struct nv50_mstc *mstc = msto->mstc;
 	struct nv50_mstm *mstm = mstc->mstm;
 
-	if (mstc->port)
+	if (!drm_connector_is_unregistered(&mstc->connector))
 		drm_dp_mst_reset_vcpi_slots(&mstm->mgr, mstc->port);
 
 	mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
@@ -967,7 +970,7 @@ nv50_mstc_detect(struct drm_connector *connector, bool force)
 	enum drm_connector_status conn_status;
 	int ret;
 
-	if (!mstc->port)
+	if (drm_connector_is_unregistered(&mstc->connector))
 		return connector_status_disconnected;
 
 	ret = pm_runtime_get_sync(connector->dev->dev);
@@ -1105,10 +1108,6 @@ nv50_mstm_destroy_connector(struct drm_dp_mst_topology_mgr *mgr,
 
 	drm_fb_helper_remove_one_connector(&drm->fbcon->helper, &mstc->connector);
 
-	drm_modeset_lock(&drm->dev->mode_config.connection_mutex, NULL);
-	mstc->port = NULL;
-	drm_modeset_unlock(&drm->dev->mode_config.connection_mutex);
-
 	drm_connector_put(&mstc->connector);
 }
 
-- 
2.19.1

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