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kms/connector: Fix updating the state when drmConnector is NULL

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When a docking station is disconnected, a few previously existing DRM
connectors may now be gone. When this happens, getting them via the
libdrm API results in NULL pointers returning, and we need to handle
this gracefully by making sure the connector state is properly updated.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2097>
This commit is contained in:
Jonas Ådahl 2021-11-18 17:15:57 +01:00
parent 989cc2e247
commit 8546ca31ff
1 changed files with 14 additions and 8 deletions
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22
src/backends/native/meta-kms-connector.c
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@ -138,7 +138,9 @@ sync_fd_held (MetaKmsConnector *connector,
{
gboolean should_hold_fd;
should_hold_fd = connector->current_state->current_crtc_id != 0;
should_hold_fd =
connector->current_state &&
connector->current_state->current_crtc_id != 0;
if (connector->fd_held == should_hold_fd)
return;
@ -569,6 +571,13 @@ meta_kms_connector_read_state (MetaKmsConnector *connector,
current_state = g_steal_pointer (&connector->current_state);
changes = META_KMS_UPDATE_CHANGE_NONE;
if (!drm_connector)
{
if (current_state)
changes = META_KMS_UPDATE_CHANGE_FULL;
goto out;
}
if (drm_connector->connection != DRM_MODE_CONNECTED)
{
if (drm_connector->connection != connector->connection)
@ -577,7 +586,7 @@ meta_kms_connector_read_state (MetaKmsConnector *connector,
changes |= META_KMS_UPDATE_CHANGE_FULL;
}
return changes;
goto out;
}
state = meta_kms_connector_state_new ();
@ -616,8 +625,8 @@ meta_kms_connector_read_state (MetaKmsConnector *connector,
changes |= connector_changes;
}
if (changes != META_KMS_UPDATE_CHANGE_NONE)
sync_fd_held (connector, impl_device);
out:
sync_fd_held (connector, impl_device);
return changes;
}
@ -634,13 +643,10 @@ meta_kms_connector_update_state (MetaKmsConnector *connector,
drm_connector = drmModeGetConnector (meta_kms_impl_device_get_fd (impl_device),
connector->id);
if (!drm_connector)
return META_KMS_UPDATE_CHANGE_FULL;
changes = meta_kms_connector_read_state (connector, impl_device,
drm_connector,
drm_resources);
drmModeFreeConnector (drm_connector);
g_clear_pointer (&drm_connector, drmModeFreeConnector);
return changes;
}