--- a/drivers/net/wireless/p54/p54spi.c
+++ b/drivers/net/wireless/p54/p54spi.c
@@ -656,6 +656,7 @@ static int __devinit p54spi_probe(struct
 	init_completion(&priv->fw_comp);
 	INIT_LIST_HEAD(&priv->tx_pending);
 	mutex_init(&priv->mutex);
+	spin_lock_init(&priv->tx_lock);
 	SET_IEEE80211_DEV(hw, &spi->dev);
 	priv->common.open = p54spi_op_start;
 	priv->common.stop = p54spi_op_stop;
