Merge branch 'sxgbe-stmmac-remove-private-tx-lock'

Lino Sanfilippo says:

====================
Remove private tx queue locks

this patch series removes unnecessary private locks in the sxgbe and the
stmmac driver.

v2:
- adjust commit message
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/samsung/sxgbe/sxgbe_common.h

@@ -384,7 +384,6 @@ struct sxgbe_tx_queue {
 	dma_addr_t *tx_skbuff_dma;
 	struct sk_buff **tx_skbuff;
 	struct timer_list txtimer;
-	spinlock_t tx_lock;	/* lock for tx queues */
 	unsigned int cur_tx;
 	unsigned int dirty_tx;
 	u32 tx_count_frames;

drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c

@@ -426,9 +426,6 @@ static int init_tx_ring(struct device *dev, u8 queue_no,
 	tx_ring->dirty_tx = 0;
 	tx_ring->cur_tx = 0;
 
-	/* initialise TX queue lock */
-	spin_lock_init(&tx_ring->tx_lock);
-
 	return 0;
 
 dmamem_err:
@@ -743,7 +740,7 @@ static void sxgbe_tx_queue_clean(struct sxgbe_tx_queue *tqueue)
 
 	dev_txq = netdev_get_tx_queue(priv->dev, queue_no);
 
-	spin_lock(&tqueue->tx_lock);
+	__netif_tx_lock(dev_txq, smp_processor_id());
 
 	priv->xstats.tx_clean++;
 	while (tqueue->dirty_tx != tqueue->cur_tx) {
@@ -782,17 +779,12 @@ static void sxgbe_tx_queue_clean(struct sxgbe_tx_queue *tqueue)
 	/* wake up queue */
 	if (unlikely(netif_tx_queue_stopped(dev_txq) &&
 	    sxgbe_tx_avail(tqueue, tx_rsize) > SXGBE_TX_THRESH(priv))) {
-		netif_tx_lock(priv->dev);
-		if (netif_tx_queue_stopped(dev_txq) &&
-		    sxgbe_tx_avail(tqueue, tx_rsize) > SXGBE_TX_THRESH(priv)) {
 		if (netif_msg_tx_done(priv))
 			pr_debug("%s: restart transmit\n", __func__);
 		netif_tx_wake_queue(dev_txq);
 	}
-		netif_tx_unlock(priv->dev);
-	}
 
-	spin_unlock(&tqueue->tx_lock);
+	__netif_tx_unlock(dev_txq);
 }
 
 /**
@@ -1304,9 +1296,6 @@ static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
 		      tqueue->hwts_tx_en)))
 		ctxt_desc_req = 1;
 
-	/* get the spinlock */
-	spin_lock(&tqueue->tx_lock);
-
 	if (priv->tx_path_in_lpi_mode)
 		sxgbe_disable_eee_mode(priv);
 
@@ -1316,8 +1305,6 @@ static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
 			netdev_err(dev, "%s: Tx Ring is full when %d queue is awake\n",
 				   __func__, txq_index);
 		}
-		/* release the spin lock in case of BUSY */
-		spin_unlock(&tqueue->tx_lock);
 		return NETDEV_TX_BUSY;
 	}
 
@@ -1436,8 +1423,6 @@ static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	priv->hw->dma->enable_dma_transmission(priv->ioaddr, txq_index);
 
-	spin_unlock(&tqueue->tx_lock);
-
 	return NETDEV_TX_OK;
 }
 

drivers/net/ethernet/stmicro/stmmac/stmmac.h

@@ -64,7 +64,6 @@ struct stmmac_priv {
 	dma_addr_t dma_tx_phy;
 	int tx_coalesce;
 	int hwts_tx_en;
-	spinlock_t tx_lock;
 	bool tx_path_in_lpi_mode;
 	struct timer_list txtimer;
 	bool tso;

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1308,7 +1308,7 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
 	unsigned int bytes_compl = 0, pkts_compl = 0;
 	unsigned int entry = priv->dirty_tx;
 
-	spin_lock(&priv->tx_lock);
+	netif_tx_lock(priv->dev);
 
 	priv->xstats.tx_clean++;
 
@@ -1380,21 +1380,16 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
 
 	if (unlikely(netif_queue_stopped(priv->dev) &&
 	    stmmac_tx_avail(priv) > STMMAC_TX_THRESH)) {
-		netif_tx_lock(priv->dev);
-		if (netif_queue_stopped(priv->dev) &&
-		    stmmac_tx_avail(priv) > STMMAC_TX_THRESH) {
 		netif_dbg(priv, tx_done, priv->dev,
 			  "%s: restart transmit\n", __func__);
 		netif_wake_queue(priv->dev);
 	}
-		netif_tx_unlock(priv->dev);
-	}
 
 	if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
 		stmmac_enable_eee_mode(priv);
 		mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
 	}
-	spin_unlock(&priv->tx_lock);
+	netif_tx_unlock(priv->dev);
 }
 
 static inline void stmmac_enable_dma_irq(struct stmmac_priv *priv)
@@ -2002,8 +1997,6 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 	u8 proto_hdr_len;
 	int i;
 
-	spin_lock(&priv->tx_lock);
-
 	/* Compute header lengths */
 	proto_hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 
@@ -2017,7 +2010,6 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 				   "%s: Tx Ring full when queue awake\n",
 				   __func__);
 		}
-		spin_unlock(&priv->tx_lock);
 		return NETDEV_TX_BUSY;
 	}
 
@@ -2152,11 +2144,9 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 	priv->hw->dma->set_tx_tail_ptr(priv->ioaddr, priv->tx_tail_addr,
 				       STMMAC_CHAN0);
 
-	spin_unlock(&priv->tx_lock);
 	return NETDEV_TX_OK;
 
 dma_map_err:
-	spin_unlock(&priv->tx_lock);
 	dev_err(priv->device, "Tx dma map failed\n");
 	dev_kfree_skb(skb);
 	priv->dev->stats.tx_dropped++;
@@ -2188,10 +2178,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 			return stmmac_tso_xmit(skb, dev);
 	}
 
-	spin_lock(&priv->tx_lock);
-
 	if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
-		spin_unlock(&priv->tx_lock);
 		if (!netif_queue_stopped(dev)) {
 			netif_stop_queue(dev);
 			/* This is a hard error, log it. */
@@ -2362,11 +2349,9 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		priv->hw->dma->set_tx_tail_ptr(priv->ioaddr, priv->tx_tail_addr,
 					       STMMAC_CHAN0);
 
-	spin_unlock(&priv->tx_lock);
 	return NETDEV_TX_OK;
 
 dma_map_err:
-	spin_unlock(&priv->tx_lock);
 	netdev_err(priv->dev, "Tx DMA map failed\n");
 	dev_kfree_skb(skb);
 	priv->dev->stats.tx_dropped++;
@@ -3353,7 +3338,6 @@ int stmmac_dvr_probe(struct device *device,
 	netif_napi_add(ndev, &priv->napi, stmmac_poll, 64);
 
 	spin_lock_init(&priv->lock);
-	spin_lock_init(&priv->tx_lock);
 
 	ret = register_netdev(ndev);
 	if (ret) {