Commit 7c451230 authored by Lyude Paul's avatar Lyude Paul Committed by Joonas Lahtinen

drm/i915: Fix possible race in intel_dp_add_mst_connector()

This hasn't caused any issues yet that I'm aware of, but as Ville
Syrjälä pointed out - we need to make sure that
intel_connector->mst_port is set before initializing MST connectors,
since in theory we could potentially check intel_connector->mst_port in
i915_hpd_poll_init_work() after registering the connector but before
having written it's value.
Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20181106213017.14563-2-lyude@redhat.com
(cherry picked from commit 66a5ab10)
Signed-off-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
parent fb5bbae9
......@@ -452,6 +452,10 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
if (!intel_connector)
return NULL;
intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
intel_connector->mst_port = intel_dp;
intel_connector->port = port;
connector = &intel_connector->base;
ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
......@@ -462,10 +466,6 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
intel_connector->mst_port = intel_dp;
intel_connector->port = port;
for_each_pipe(dev_priv, pipe) {
struct drm_encoder *enc =
&intel_dp->mst_encoders[pipe]->base.base;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment