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smc911x: Make the driver safer on SMP
This patch extends the critical regions covered by lp->lock to make it safer on SMP. The main failure point was the smc911x_hard_start_xmit function being called from different CPUs. It was tested on the ARM SMP platforms. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
parent
319edafef6
commit
b891a9023b
1 changed files with 8 additions and 17 deletions
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@ -155,23 +155,17 @@ static void PRINT_PKT(u_char *buf, int length)
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/* this enables an interrupt in the interrupt mask register */
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#define SMC_ENABLE_INT(lp, x) do { \
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unsigned int __mask; \
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unsigned long __flags; \
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spin_lock_irqsave(&lp->lock, __flags); \
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__mask = SMC_GET_INT_EN((lp)); \
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__mask |= (x); \
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SMC_SET_INT_EN((lp), __mask); \
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spin_unlock_irqrestore(&lp->lock, __flags); \
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} while (0)
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/* this disables an interrupt from the interrupt mask register */
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#define SMC_DISABLE_INT(lp, x) do { \
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unsigned int __mask; \
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unsigned long __flags; \
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spin_lock_irqsave(&lp->lock, __flags); \
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__mask = SMC_GET_INT_EN((lp)); \
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__mask &= ~(x); \
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SMC_SET_INT_EN((lp), __mask); \
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spin_unlock_irqrestore(&lp->lock, __flags); \
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} while (0)
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/*
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@ -279,6 +273,8 @@ static void smc911x_enable(struct net_device *dev)
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DBG(SMC_DEBUG_FUNC, "%s: --> %s\n", dev->name, __func__);
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spin_lock_irqsave(&lp->lock, flags);
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SMC_SET_MAC_ADDR(lp, dev->dev_addr);
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/* Enable TX */
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@ -291,12 +287,10 @@ static void smc911x_enable(struct net_device *dev)
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SMC_SET_FIFO_TSL(lp, 64);
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SMC_SET_GPT_CFG(lp, GPT_CFG_TIMER_EN_ | 10000);
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spin_lock_irqsave(&lp->lock, flags);
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SMC_GET_MAC_CR(lp, cr);
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cr |= MAC_CR_TXEN_ | MAC_CR_HBDIS_;
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SMC_SET_MAC_CR(lp, cr);
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SMC_SET_TX_CFG(lp, TX_CFG_TX_ON_);
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spin_unlock_irqrestore(&lp->lock, flags);
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/* Add 2 byte padding to start of packets */
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SMC_SET_RX_CFG(lp, (2<<8) & RX_CFG_RXDOFF_);
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@ -305,9 +299,7 @@ static void smc911x_enable(struct net_device *dev)
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if (cr & MAC_CR_RXEN_)
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DBG(SMC_DEBUG_RX, "%s: Receiver already enabled\n", dev->name);
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spin_lock_irqsave(&lp->lock, flags);
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SMC_SET_MAC_CR(lp, cr | MAC_CR_RXEN_);
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spin_unlock_irqrestore(&lp->lock, flags);
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/* Interrupt on every received packet */
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SMC_SET_FIFO_RSA(lp, 0x01);
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@ -323,6 +315,8 @@ static void smc911x_enable(struct net_device *dev)
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mask|=INT_EN_RDFO_EN_;
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}
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SMC_ENABLE_INT(lp, mask);
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spin_unlock_irqrestore(&lp->lock, flags);
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}
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/*
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@ -463,7 +457,6 @@ static void smc911x_hardware_send_pkt(struct net_device *dev)
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struct sk_buff *skb;
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unsigned int cmdA, cmdB, len;
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unsigned char *buf;
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unsigned long flags;
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DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, "%s: --> %s\n", dev->name, __func__);
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BUG_ON(lp->pending_tx_skb == NULL);
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@ -508,11 +501,9 @@ static void smc911x_hardware_send_pkt(struct net_device *dev)
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dev->trans_start = jiffies;
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dev_kfree_skb(skb);
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#endif
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spin_lock_irqsave(&lp->lock, flags);
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if (!lp->tx_throttle) {
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netif_wake_queue(dev);
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}
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spin_unlock_irqrestore(&lp->lock, flags);
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SMC_ENABLE_INT(lp, INT_EN_TDFA_EN_ | INT_EN_TSFL_EN_);
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}
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@ -531,6 +522,8 @@ static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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DBG(SMC_DEBUG_FUNC | SMC_DEBUG_TX, "%s: --> %s\n",
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dev->name, __func__);
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spin_lock_irqsave(&lp->lock, flags);
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BUG_ON(lp->pending_tx_skb != NULL);
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free = SMC_GET_TX_FIFO_INF(lp) & TX_FIFO_INF_TDFREE_;
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@ -540,12 +533,10 @@ static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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if (free <= SMC911X_TX_FIFO_LOW_THRESHOLD) {
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DBG(SMC_DEBUG_TX, "%s: Disabling data flow due to low FIFO space (%d)\n",
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dev->name, free);
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spin_lock_irqsave(&lp->lock, flags);
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/* Reenable when at least 1 packet of size MTU present */
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SMC_SET_FIFO_TDA(lp, (SMC911X_TX_FIFO_LOW_THRESHOLD)/64);
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lp->tx_throttle = 1;
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netif_stop_queue(dev);
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spin_unlock_irqrestore(&lp->lock, flags);
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}
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/* Drop packets when we run out of space in TX FIFO
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@ -561,6 +552,7 @@ static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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lp->pending_tx_skb = NULL;
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dev->stats.tx_errors++;
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dev->stats.tx_dropped++;
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spin_unlock_irqrestore(&lp->lock, flags);
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dev_kfree_skb(skb);
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return 0;
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}
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@ -570,7 +562,6 @@ static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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/* If the DMA is already running then defer this packet Tx until
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* the DMA IRQ starts it
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*/
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spin_lock_irqsave(&lp->lock, flags);
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if (lp->txdma_active) {
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DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: Tx DMA running, deferring packet\n", dev->name);
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lp->pending_tx_skb = skb;
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@ -581,11 +572,11 @@ static int smc911x_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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DBG(SMC_DEBUG_TX | SMC_DEBUG_DMA, "%s: Activating Tx DMA\n", dev->name);
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lp->txdma_active = 1;
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}
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spin_unlock_irqrestore(&lp->lock, flags);
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}
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#endif
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lp->pending_tx_skb = skb;
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smc911x_hardware_send_pkt(dev);
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spin_unlock_irqrestore(&lp->lock, flags);
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return 0;
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}
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