diff options
Diffstat (limited to 'drivers/gpu/drm/drm_dp_mst_topology.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 5ff1d79b86c4..529414556962 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1275,6 +1275,9 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_ mutex_lock(&mgr->lock); mstb = mgr->mst_primary; + if (!mstb) + goto out; + for (i = 0; i < lct - 1; i++) { int shift = (i % 2) ? 0 : 4; int port_num = (rad[i / 2] >> shift) & 0xf; @@ -2569,9 +2572,16 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_ EXPORT_SYMBOL(drm_dp_mst_get_edid); /** - * drm_dp_find_vcpi_slots() - find slots for this PBN value + * drm_dp_find_vcpi_slots() - Find VCPI slots for this PBN value * @mgr: manager to use * @pbn: payload bandwidth to convert into slots. + * + * Calculate the number of VCPI slots that will be required for the given PBN + * value. This function is deprecated, and should not be used in atomic + * drivers. + * + * RETURNS: + * The total slots required for this port, or error. */ int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, int pbn) |