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drm/crtc: take references to connectors used in a modeset. (v2) 

This just takes a reference on the connector when we set a mode
in the non-atomic paths.

v2: Follow Daniel Stone's suggestions on when to take/drop
references.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2016-04-27 11:27:54 +10:00
parent 6e86d58be3
commit 0955c1250e
1 changed files with 19 additions and 0 deletions
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19
drivers/gpu/drm/drm_crtc_helper.c
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@ -456,6 +456,9 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
* between them is henceforth no longer available.
*/
connector->dpms = DRM_MODE_DPMS_OFF;
/* we keep a reference while the encoder is bound */
drm_connector_unreference(connector);
}
}
@ -606,6 +609,11 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
mode_changed = true;
}
/* take a reference on all connectors in set */
for (ro = 0; ro < set->num_connectors; ro++) {
drm_connector_reference(set->connectors[ro]);
}
/* a) traverse passed in connector list and get encoders for them */
count = 0;
drm_for_each_connector(connector, dev) {
@ -724,6 +732,12 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
}
}
/* after fail drop reference on all connectors in save set */
count = 0;
drm_for_each_connector(connector, dev) {
drm_connector_unreference(&save_connectors[count++]);
}
kfree(save_connectors);
kfree(save_encoders);
return 0;
@ -740,6 +754,11 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
*connector = save_connectors[count++];
}
/* after fail drop reference on all connectors in set */
for (ro = 0; ro < set->num_connectors; ro++) {
drm_connector_unreference(set->connectors[ro]);
}
/* Try to restore the config */
if (mode_changed &&
!drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,