Issue #2867189 by MegaChriz: Added a method to FeedsSource to unlock a feed.

feeds.pages.inc

@@ -252,17 +252,13 @@ function feeds_unlock_tab_form($form, &$form_state, FeedsImporter $importer = NU
  * Form submit handler. Resets all feeds state.
  */
 function feeds_unlock_tab_form_submit($form, &$form_state) {
-  drupal_set_message(t('Import Unlocked'));
   $form_state['redirect'] = $form['#redirect'];
   $feed_nid = empty($form['#feed_nid']) ? 0 : $form['#feed_nid'];
   $importer_id = $form['#importer_id'];
 
-  //Is there a more API-friendly way to set the state?
-  db_update('feeds_source')
-    ->condition('id', $importer_id)
-    ->condition('feed_nid', $feed_nid)
-    ->fields(array('state' => FALSE))
-    ->execute();
+  feeds_source($importer_id, $feed_nid)
+    ->unlock();
+  drupal_set_message(t('Importer unlocked.'));
 }
 
 /**

includes/FeedsSource.inc

@@ -625,6 +625,15 @@ class FeedsSource extends FeedsConfigurable {
     return $this->importer->processor->itemCount($this);
   }
 
+  /**
+   * Unlocks a feed.
+   */
+  public function unlock() {
+    $this->clearStates();
+    $this->save();
+    $this->releaseLock();
+  }
+
   /**
    * Save configuration.
    */