[PATCH 07/15] drm/dp_mst: Fill branch->num_ports

[mikita.lipski]

From: David Francis <david.fran...@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

Signed-off-by: David Francis <david.fran...@amd.com>
Reviewed-by: Lyude Paul <ly...@redhat.com>
Reviewed-by: Harry Wentland <harry.wentl...@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 c1a7ddfdc4bd..ae2f986d76a2 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1670,6 +1670,7 @@ static void drm_dp_add_port(struct drm_dp_mst_branch 
*mstb,
                mutex_lock(&mstb->mgr->lock);
                drm_dp_mst_topology_get_port(port);
                list_add(&port->next, &mstb->ports);
+               mstb->num_ports++;
                mutex_unlock(&mstb->mgr->lock);
        }
 
@@ -1704,6 +1705,7 @@ static void drm_dp_add_port(struct drm_dp_mst_branch 
*mstb,
                        /* remove it from the port list */
                        mutex_lock(&mstb->mgr->lock);
                        list_del(&port->next);
+                       mstb->num_ports--;
                        mutex_unlock(&mstb->mgr->lock);
                        /* drop port list reference */
                        drm_dp_mst_topology_put_port(port);
-- 
2.17.1

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