提交 72cb9a9d 编写于 作者: L Lyude Paul 提交者: Greg Kroah-Hartman

drm/i915: Fix possible race in intel_dp_add_mst_connector()

commit 7c4512300cfa5a4dcc8c1c52ae61e3fa4bd11a39 upstream.

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: NLyude Paul <lyude@redhat.com>
Reviewed-by: NVille 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 66a5ab1034be801630816d1fa6cfc30db1a2f0b0)
Signed-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 7a268b8f
......@@ -458,6 +458,10 @@ 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);
......@@ -468,10 +472,6 @@ 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;
......
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