[PATCH v4 11/16] drm/nouveau: Stop unsetting mstc->port, use malloc refs

[Lyude Paul]

Same as we did for i915, but for nouveau this time. Additionally, we
grab a malloc reference to the port that lasts for the entire lifetime
of nv50_mstc, which gives us the guarantee that mstc->port will always
point to valid memory for as long as the mstc stays around.

Signed-off-by: Lyude Paul <ly...@redhat.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: David Airlie <airl...@redhat.com>
Cc: Jerry Zuo <jerry....@amd.com>
Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Juston Li <juston...@intel.com>
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c 
b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 982054bbcc8b..157d208d37b5 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -709,8 +709,7 @@ nv50_msto_cleanup(struct nv50_msto *msto)
 
        NV_ATOMIC(drm, "%s: msto cleanup\n", msto->encoder.name);
 
-       if (mstc->port)
-               drm_dp_mst_deallocate_vcpi(&mstm->mgr, mstc->port);
+       drm_dp_mst_deallocate_vcpi(&mstm->mgr, mstc->port);
 
        msto->mstc = NULL;
        msto->head = NULL;
@@ -735,7 +734,7 @@ 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 (mstc->port->vcpi.vcpi > 0) {
                struct drm_dp_payload *payload = nv50_msto_payload(msto);
                if (payload) {
                        args.vcpi.start_slot = payload->start_slot;
@@ -832,8 +831,7 @@ nv50_msto_disable(struct drm_encoder *encoder)
        struct nv50_mstc *mstc = msto->mstc;
        struct nv50_mstm *mstm = mstc->mstm;
 
-       if (mstc->port)
-               drm_dp_mst_reset_vcpi_slots(&mstm->mgr, mstc->port);
+       drm_dp_mst_reset_vcpi_slots(&mstm->mgr, mstc->port);
 
        mstm->outp->update(mstm->outp, msto->head->base.index, NULL, 0, 0);
        mstm->modified = true;
@@ -945,7 +943,7 @@ 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(connector))
                return connector_status_disconnected;
 
        ret = pm_runtime_get_sync(connector->dev->dev);
@@ -966,8 +964,7 @@ nv50_mstc_destroy(struct drm_connector *connector)
        struct nv50_mstc *mstc = nv50_mstc(connector);
 
        drm_connector_cleanup(&mstc->connector);
-       if (mstc->port)
-               drm_dp_mst_put_port_malloc(mstc->port);
+       drm_dp_mst_put_port_malloc(mstc->port);
 
        kfree(mstc);
 }
@@ -1081,11 +1078,6 @@ 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);
-       drm_dp_mst_put_port_malloc(mstc->port);
-       mstc->port = NULL;
-       drm_modeset_unlock(&drm->dev->mode_config.connection_mutex);
-
        drm_connector_put(&mstc->connector);
 }
 
-- 
2.20.1

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