static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
{
void *edid;
+ struct drm_device *dev = connector->dev;
+ struct ast_device *ast = to_ast_device(dev);
int succ;
int count;
if (!edid)
goto err_drm_connector_update_edid_property;
+ /*
+ * Protect access to I/O registers from concurrent modesetting
+ * by acquiring the I/O-register lock.
+ */
+ mutex_lock(&ast->ioregs_lock);
+
succ = ast_astdp_read_edid(connector->dev, edid);
if (succ < 0)
- goto err_kfree;
+ goto err_mutex_unlock;
+
+ mutex_unlock(&ast->ioregs_lock);
drm_connector_update_edid_property(connector, edid);
count = drm_add_edid_modes(connector, edid);
return count;
-err_kfree:
+err_mutex_unlock:
+ mutex_unlock(&ast->ioregs_lock);
kfree(edid);
err_drm_connector_update_edid_property:
drm_connector_update_edid_property(connector, NULL);