--- /dev/null
+Index: compat-wireless-2011-11-04/drivers/net/wireless/p54/p54spi.c
+===================================================================
+--- compat-wireless-2011-11-04.orig/drivers/net/wireless/p54/p54spi.c 2011-11-05 20:30:04.000000000 +0100
++++ compat-wireless-2011-11-04/drivers/net/wireless/p54/p54spi.c 2011-11-16 22:12:03.648829886 +0100
+@@ -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;
--- /dev/null
+Index: compat-wireless-2011-11-04/drivers/net/wireless/p54/p54spi.c
+===================================================================
+--- compat-wireless-2011-11-04.orig/drivers/net/wireless/p54/p54spi.c 2011-11-16 22:12:03.648829886 +0100
++++ compat-wireless-2011-11-04/drivers/net/wireless/p54/p54spi.c 2011-11-16 22:15:28.931976935 +0100
+@@ -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);