--- a/drivers/net/wireless/p54/p54spi.c
+++ b/drivers/net/wireless/p54/p54spi.c
@@ -581,11 +581,7 @@ static void p54spi_op_stop(struct ieee80
 	struct p54s_priv *priv = dev->priv;
 	unsigned long flags;
 
-	if (mutex_lock_interruptible(&priv->mutex)) {
-		/* FIXME: how to handle this error? */
-		return;
-	}
-
+	mutex_lock(&priv->mutex);
 	WARN_ON(priv->fw_state != FW_STATE_READY);
 
 	cancel_work_sync(&priv->work);