[PATCH v8 04/17] drm/dp_mst: Fill branch->num_ports

[mikita.lipski at amd.com]

From: David Francis <David.Francis at amd.com>

This field on drm_dp_mst_branch was never filled

It is initialized to zero when the port is kzallocced.
When a port is added to the list, increment num_ports,
and when a port is removed from the list, decrement num_ports.

v2: remember to decrement on port removal
v3: don't explicitly init to 0

Reviewed-by: Lyude Paul <lyude at redhat.com>
Reviewed-by: Harry Wentland <harry.wentland at amd.com>
Signed-off-by: David Francis <David.Francis at amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski at amd.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 06aae9b52e8a..d74b767d0fe1 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2129,6 +2129,7 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
 	build_mst_prop_path(mstb, port->port_num, proppath, sizeof(proppath));
 	port->connector = mgr->cbs->add_connector(mgr, port, proppath);
 	if (!port->connector) {
+		mstb->num_ports--;
 		ret = -ENOMEM;
 		goto error;
 	}
@@ -2256,6 +2257,7 @@ drm_dp_mst_handle_link_address_port(struct drm_dp_mst_branch *mstb,
 		mutex_lock(&mgr->lock);
 		drm_dp_mst_topology_get_port(port);
 		list_add(&port->next, &mstb->ports);
+		mstb->num_ports++;
 		mutex_unlock(&mgr->lock);
 	}
 
-- 
2.17.1