[TG3]: Eliminate all hw IRQ handler spinlocks.

Move all driver spinlocks to be taken at sw IRQ
context only.

This fixes the skb_copy() we were doing with hw
IRQs disabled (which is illegal and triggers a
BUG() with HIGHMEM enabled).  It also simplifies
the locking all over the driver tremendously.

We accomplish this feat by creating a special
sequence to synchronize with the hw IRQ handler
using a binary state and synchronize_irq().
This idea is from Herbert Xu.

Thanks to Michael Chan for helping to track down
all of the race conditions in initial versions
of this code.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -337,12 +337,10 @@ static struct {
 static void tg3_write_indirect_reg32(struct tg3 *tp, u32 off, u32 val)
 {
 	if ((tp->tg3_flags & TG3_FLAG_PCIX_TARGET_HWBUG) != 0) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&tp->indirect_lock, flags);
+		spin_lock_bh(&tp->indirect_lock);
 		pci_write_config_dword(tp->pdev, TG3PCI_REG_BASE_ADDR, off);
 		pci_write_config_dword(tp->pdev, TG3PCI_REG_DATA, val);
-		spin_unlock_irqrestore(&tp->indirect_lock, flags);
+		spin_unlock_bh(&tp->indirect_lock);
 	} else {
 		writel(val, tp->regs + off);
 		if ((tp->tg3_flags & TG3_FLAG_5701_REG_WRITE_BUG) != 0)
@@ -353,12 +351,10 @@ static void tg3_write_indirect_reg32(struct tg3 *tp, u32 off, u32 val)
 static void _tw32_flush(struct tg3 *tp, u32 off, u32 val)
 {
 	if ((tp->tg3_flags & TG3_FLAG_PCIX_TARGET_HWBUG) != 0) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&tp->indirect_lock, flags);
+		spin_lock_bh(&tp->indirect_lock);
 		pci_write_config_dword(tp->pdev, TG3PCI_REG_BASE_ADDR, off);
 		pci_write_config_dword(tp->pdev, TG3PCI_REG_DATA, val);
-		spin_unlock_irqrestore(&tp->indirect_lock, flags);
+		spin_unlock_bh(&tp->indirect_lock);
 	} else {
 		void __iomem *dest = tp->regs + off;
 		writel(val, dest);
@@ -398,28 +394,24 @@ static inline void _tw32_tx_mbox(struct tg3 *tp, u32 off, u32 val)
 
 static void tg3_write_mem(struct tg3 *tp, u32 off, u32 val)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&tp->indirect_lock, flags);
+	spin_lock_bh(&tp->indirect_lock);
 	pci_write_config_dword(tp->pdev, TG3PCI_MEM_WIN_BASE_ADDR, off);
 	pci_write_config_dword(tp->pdev, TG3PCI_MEM_WIN_DATA, val);
 
 	/* Always leave this as zero. */
 	pci_write_config_dword(tp->pdev, TG3PCI_MEM_WIN_BASE_ADDR, 0);
-	spin_unlock_irqrestore(&tp->indirect_lock, flags);
+	spin_unlock_bh(&tp->indirect_lock);
 }
 
 static void tg3_read_mem(struct tg3 *tp, u32 off, u32 *val)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&tp->indirect_lock, flags);
+	spin_lock_bh(&tp->indirect_lock);
 	pci_write_config_dword(tp->pdev, TG3PCI_MEM_WIN_BASE_ADDR, off);
 	pci_read_config_dword(tp->pdev, TG3PCI_MEM_WIN_DATA, val);
 
 	/* Always leave this as zero. */
 	pci_write_config_dword(tp->pdev, TG3PCI_MEM_WIN_BASE_ADDR, 0);
-	spin_unlock_irqrestore(&tp->indirect_lock, flags);
+	spin_unlock_bh(&tp->indirect_lock);
 }
 
 static void tg3_disable_ints(struct tg3 *tp)
@@ -443,7 +435,7 @@ static void tg3_enable_ints(struct tg3 *tp)
 	tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW,
 		     (tp->last_tag << 24));
 	tr32(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW);
-
+	tp->irq_sync = 0;
 	tg3_cond_int(tp);
 }
 
@@ -504,7 +496,8 @@ static inline void tg3_netif_start(struct tg3 *tp)
 	 * (such as after tg3_init_hw)
 	 */
 	netif_poll_enable(tp->dev);
-	tg3_cond_int(tp);
+	tp->hw_status->status |= SD_STATUS_UPDATED;
+	tg3_enable_ints(tp);
 }
 
 static void tg3_switch_clocks(struct tg3 *tp)
@@ -2578,7 +2571,7 @@ static void tg3_tx(struct tg3 *tp)
 			sw_idx = NEXT_TX(sw_idx);
 		}
 
-		dev_kfree_skb_irq(skb);
+		dev_kfree_skb(skb);
 	}
 
 	tp->tx_cons = sw_idx;
@@ -2884,11 +2877,8 @@ static int tg3_poll(struct net_device *netdev, int *budget)
 {
 	struct tg3 *tp = netdev_priv(netdev);
 	struct tg3_hw_status *sblk = tp->hw_status;
-	unsigned long flags;
 	int done;
 
-	spin_lock_irqsave(&tp->lock, flags);
-
 	/* handle link change and other phy events */
 	if (!(tp->tg3_flags &
 	      (TG3_FLAG_USE_LINKCHG_REG |
@@ -2896,7 +2886,9 @@ static int tg3_poll(struct net_device *netdev, int *budget)
 		if (sblk->status & SD_STATUS_LINK_CHG) {
 			sblk->status = SD_STATUS_UPDATED |
 				(sblk->status & ~SD_STATUS_LINK_CHG);
+			spin_lock(&tp->lock);
 			tg3_setup_phy(tp, 0);
+			spin_unlock(&tp->lock);
 		}
 	}
 
@@ -2907,8 +2899,6 @@ static int tg3_poll(struct net_device *netdev, int *budget)
 		spin_unlock(&tp->tx_lock);
 	}
 
-	spin_unlock_irqrestore(&tp->lock, flags);
-
 	/* run RX thread, within the bounds set by NAPI.
 	 * All RX "locking" is done by ensuring outside
 	 * code synchronizes with dev->poll()
@@ -2934,15 +2924,49 @@ static int tg3_poll(struct net_device *netdev, int *budget)
 	/* if no more work, tell net stack and NIC we're done */
 	done = !tg3_has_work(tp);
 	if (done) {
-		spin_lock_irqsave(&tp->lock, flags);
-		__netif_rx_complete(netdev);
+		spin_lock(&tp->lock);
+		netif_rx_complete(netdev);
 		tg3_restart_ints(tp);
-		spin_unlock_irqrestore(&tp->lock, flags);
+		spin_unlock(&tp->lock);
 	}
 
 	return (done ? 0 : 1);
 }
 
+static void tg3_irq_quiesce(struct tg3 *tp)
+{
+	BUG_ON(tp->irq_sync);
+
+	tp->irq_sync = 1;
+	smp_mb();
+
+	synchronize_irq(tp->pdev->irq);
+}
+
+static inline int tg3_irq_sync(struct tg3 *tp)
+{
+	return tp->irq_sync;
+}
+
+/* Fully shutdown all tg3 driver activity elsewhere in the system.
+ * If irq_sync is non-zero, then the IRQ handler must be synchronized
+ * with as well.  Most of the time, this is not necessary except when
+ * shutting down the device.
+ */
+static inline void tg3_full_lock(struct tg3 *tp, int irq_sync)
+{
+	if (irq_sync)
+		tg3_irq_quiesce(tp);
+	spin_lock_bh(&tp->lock);
+	spin_lock(&tp->tx_lock);
+}
+
+static inline void tg3_full_unlock(struct tg3 *tp)
+{
+	spin_unlock(&tp->tx_lock);
+	spin_unlock_bh(&tp->lock);
+}
+
 /* MSI ISR - No need to check for interrupt sharing and no need to
  * flush status block and interrupt mailbox. PCI ordering rules
  * guarantee that MSI will arrive after the status block.
@@ -2952,9 +2976,6 @@ static irqreturn_t tg3_msi(int irq, void *dev_id, struct pt_regs *regs)
 	struct net_device *dev = dev_id;
 	struct tg3 *tp = netdev_priv(dev);
 	struct tg3_hw_status *sblk = tp->hw_status;
-	unsigned long flags;
-
-	spin_lock_irqsave(&tp->lock, flags);
 
 	/*
 	 * Writing any value to intr-mbox-0 clears PCI INTA# and
@@ -2966,6 +2987,8 @@ static irqreturn_t tg3_msi(int irq, void *dev_id, struct pt_regs *regs)
 	tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW, 0x00000001);
 	tp->last_tag = sblk->status_tag;
 	rmb();
+	if (tg3_irq_sync(tp))
+		goto out;
 	sblk->status &= ~SD_STATUS_UPDATED;
 	if (likely(tg3_has_work(tp)))
 		netif_rx_schedule(dev);		/* schedule NAPI poll */
@@ -2974,9 +2997,7 @@ static irqreturn_t tg3_msi(int irq, void *dev_id, struct pt_regs *regs)
 		tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW,
 			     tp->last_tag << 24);
 	}
-
-	spin_unlock_irqrestore(&tp->lock, flags);
-
+out:
 	return IRQ_RETVAL(1);
 }
 
@@ -2985,11 +3006,8 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	struct net_device *dev = dev_id;
 	struct tg3 *tp = netdev_priv(dev);
 	struct tg3_hw_status *sblk = tp->hw_status;
-	unsigned long flags;
 	unsigned int handled = 1;
 
-	spin_lock_irqsave(&tp->lock, flags);
-
 	/* In INTx mode, it is possible for the interrupt to arrive at
 	 * the CPU before the status block posted prior to the interrupt.
 	 * Reading the PCI State register will confirm whether the
@@ -3006,6 +3024,8 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		 */
 		tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW,
 			     0x00000001);
+		if (tg3_irq_sync(tp))
+			goto out;
 		sblk->status &= ~SD_STATUS_UPDATED;
 		if (likely(tg3_has_work(tp)))
 			netif_rx_schedule(dev);		/* schedule NAPI poll */
@@ -3020,9 +3040,7 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	} else {	/* shared interrupt */
 		handled = 0;
 	}
-
-	spin_unlock_irqrestore(&tp->lock, flags);
-
+out:
 	return IRQ_RETVAL(handled);
 }
 
@@ -3031,11 +3049,8 @@ static irqreturn_t tg3_interrupt_tagged(int irq, void *dev_id, struct pt_regs *r
 	struct net_device *dev = dev_id;
 	struct tg3 *tp = netdev_priv(dev);
 	struct tg3_hw_status *sblk = tp->hw_status;
-	unsigned long flags;
 	unsigned int handled = 1;
 
-	spin_lock_irqsave(&tp->lock, flags);
-
 	/* In INTx mode, it is possible for the interrupt to arrive at
 	 * the CPU before the status block posted prior to the interrupt.
 	 * Reading the PCI State register will confirm whether the
@@ -3054,6 +3069,8 @@ static irqreturn_t tg3_interrupt_tagged(int irq, void *dev_id, struct pt_regs *r
 			     0x00000001);
 		tp->last_tag = sblk->status_tag;
 		rmb();
+		if (tg3_irq_sync(tp))
+			goto out;
 		sblk->status &= ~SD_STATUS_UPDATED;
 		if (likely(tg3_has_work(tp)))
 			netif_rx_schedule(dev);		/* schedule NAPI poll */
@@ -3068,9 +3085,7 @@ static irqreturn_t tg3_interrupt_tagged(int irq, void *dev_id, struct pt_regs *r
 	} else {	/* shared interrupt */
 		handled = 0;
 	}
-
-	spin_unlock_irqrestore(&tp->lock, flags);
-
+out:
 	return IRQ_RETVAL(handled);
 }
 
@@ -3109,8 +3124,7 @@ static void tg3_reset_task(void *_data)
 
 	tg3_netif_stop(tp);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 1);
 
 	restart_timer = tp->tg3_flags2 & TG3_FLG2_RESTART_TIMER;
 	tp->tg3_flags2 &= ~TG3_FLG2_RESTART_TIMER;
@@ -3120,8 +3134,7 @@ static void tg3_reset_task(void *_data)
 
 	tg3_netif_start(tp);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	if (restart_timer)
 		mod_timer(&tp->timer, jiffies + 1);
@@ -3227,39 +3240,21 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	unsigned int i;
 	u32 len, entry, base_flags, mss;
 	int would_hit_hwbug;
-	unsigned long flags;
 
 	len = skb_headlen(skb);
 
 	/* No BH disabling for tx_lock here.  We are running in BH disabled
 	 * context and TX reclaim runs via tp->poll inside of a software
-	 * interrupt.  Rejoice!
-	 *
-	 * Actually, things are not so simple.  If we are to take a hw
-	 * IRQ here, we can deadlock, consider:
-	 *
-	 *       CPU1		CPU2
-	 *   tg3_start_xmit
-	 *   take tp->tx_lock
-	 *			tg3_timer
-	 *			take tp->lock
-	 *   tg3_interrupt
-	 *   spin on tp->lock
-	 *			spin on tp->tx_lock
-	 *
-	 * So we really do need to disable interrupts when taking
-	 * tx_lock here.
+	 * interrupt.  Furthermore, IRQ processing runs lockless so we have
+	 * no IRQ context deadlocks to worry about either.  Rejoice!
 	 */
-	local_irq_save(flags);
-	if (!spin_trylock(&tp->tx_lock)) { 
-		local_irq_restore(flags);
+	if (!spin_trylock(&tp->tx_lock))
 		return NETDEV_TX_LOCKED; 
-	} 
 
 	/* This is a hard error, log it. */
 	if (unlikely(TX_BUFFS_AVAIL(tp) <= (skb_shinfo(skb)->nr_frags + 1))) {
 		netif_stop_queue(dev);
-		spin_unlock_irqrestore(&tp->tx_lock, flags);
+		spin_unlock(&tp->tx_lock);
 		printk(KERN_ERR PFX "%s: BUG! Tx Ring full when queue awake!\n",
 		       dev->name);
 		return NETDEV_TX_BUSY;
@@ -3424,7 +3419,7 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 out_unlock:
     	mmiowb();
-	spin_unlock_irqrestore(&tp->tx_lock, flags);
+	spin_unlock(&tp->tx_lock);
 
 	dev->trans_start = jiffies;
 
@@ -3458,8 +3453,8 @@ static int tg3_change_mtu(struct net_device *dev, int new_mtu)
 	}
 
 	tg3_netif_stop(tp);
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+
+	tg3_full_lock(tp, 1);
 
 	tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
 
@@ -3469,8 +3464,7 @@ static int tg3_change_mtu(struct net_device *dev, int new_mtu)
 
 	tg3_netif_start(tp);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	return 0;
 }
@@ -5091,9 +5085,9 @@ static int tg3_set_mac_addr(struct net_device *dev, void *p)
 
 	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 
-	spin_lock_irq(&tp->lock);
+	spin_lock_bh(&tp->lock);
 	__tg3_set_mac_addr(tp);
-	spin_unlock_irq(&tp->lock);
+	spin_unlock_bh(&tp->lock);
 
 	return 0;
 }
@@ -5805,10 +5799,8 @@ static void tg3_periodic_fetch_stats(struct tg3 *tp)
 static void tg3_timer(unsigned long __opaque)
 {
 	struct tg3 *tp = (struct tg3 *) __opaque;
-	unsigned long flags;
 
-	spin_lock_irqsave(&tp->lock, flags);
-	spin_lock(&tp->tx_lock);
+	spin_lock(&tp->lock);
 
 	if (!(tp->tg3_flags & TG3_FLAG_TAGGED_STATUS)) {
 		/* All of this garbage is because when using non-tagged
@@ -5825,8 +5817,7 @@ static void tg3_timer(unsigned long __opaque)
 
 		if (!(tr32(WDMAC_MODE) & WDMAC_MODE_ENABLE)) {
 			tp->tg3_flags2 |= TG3_FLG2_RESTART_TIMER;
-			spin_unlock(&tp->tx_lock);
-			spin_unlock_irqrestore(&tp->lock, flags);
+			spin_unlock(&tp->lock);
 			schedule_work(&tp->reset_task);
 			return;
 		}
@@ -5894,8 +5885,7 @@ static void tg3_timer(unsigned long __opaque)
 		tp->asf_counter = tp->asf_multiplier;
 	}
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irqrestore(&tp->lock, flags);
+	spin_unlock(&tp->lock);
 
 	tp->timer.expires = jiffies + tp->timer_offset;
 	add_timer(&tp->timer);
@@ -6010,14 +6000,12 @@ static int tg3_test_msi(struct tg3 *tp)
 	/* Need to reset the chip because the MSI cycle may have terminated
 	 * with Master Abort.
 	 */
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 1);
 
 	tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
 	err = tg3_init_hw(tp);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	if (err)
 		free_irq(tp->pdev->irq, dev);
@@ -6030,14 +6018,12 @@ static int tg3_open(struct net_device *dev)
 	struct tg3 *tp = netdev_priv(dev);
 	int err;
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	tg3_disable_ints(tp);
 	tp->tg3_flags &= ~TG3_FLAG_INIT_COMPLETE;
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	/* The placement of this call is tied
 	 * to the setup and use of Host TX descriptors.
@@ -6084,8 +6070,7 @@ static int tg3_open(struct net_device *dev)
 		return err;
 	}
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	err = tg3_init_hw(tp);
 	if (err) {
@@ -6109,8 +6094,7 @@ static int tg3_open(struct net_device *dev)
 		tp->timer.function = tg3_timer;
 	}
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	if (err) {
 		free_irq(tp->pdev->irq, dev);
@@ -6126,8 +6110,7 @@ static int tg3_open(struct net_device *dev)
 		err = tg3_test_msi(tp);
 
 		if (err) {
-			spin_lock_irq(&tp->lock);
-			spin_lock(&tp->tx_lock);
+			tg3_full_lock(tp, 0);
 
 			if (tp->tg3_flags2 & TG3_FLG2_USING_MSI) {
 				pci_disable_msi(tp->pdev);
@@ -6137,22 +6120,19 @@ static int tg3_open(struct net_device *dev)
 			tg3_free_rings(tp);
 			tg3_free_consistent(tp);
 
-			spin_unlock(&tp->tx_lock);
-			spin_unlock_irq(&tp->lock);
+			tg3_full_unlock(tp);
 
 			return err;
 		}
 	}
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	add_timer(&tp->timer);
 	tp->tg3_flags |= TG3_FLAG_INIT_COMPLETE;
 	tg3_enable_ints(tp);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	netif_start_queue(dev);
 
@@ -6398,8 +6378,7 @@ static int tg3_close(struct net_device *dev)
 
 	del_timer_sync(&tp->timer);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 1);
 #if 0
 	tg3_dump_state(tp);
 #endif
@@ -6413,8 +6392,7 @@ static int tg3_close(struct net_device *dev)
 		  TG3_FLAG_GOT_SERDES_FLOWCTL);
 	netif_carrier_off(tp->dev);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	free_irq(tp->pdev->irq, dev);
 	if (tp->tg3_flags2 & TG3_FLG2_USING_MSI) {
@@ -6451,16 +6429,15 @@ static unsigned long calc_crc_errors(struct tg3 *tp)
 	if (!(tp->tg3_flags2 & TG3_FLG2_PHY_SERDES) &&
 	    (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5700 ||
 	     GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5701)) {
-		unsigned long flags;
 		u32 val;
 
-		spin_lock_irqsave(&tp->lock, flags);
+		spin_lock_bh(&tp->lock);
 		if (!tg3_readphy(tp, 0x1e, &val)) {
 			tg3_writephy(tp, 0x1e, val | 0x8000);
 			tg3_readphy(tp, 0x14, &val);
 		} else
 			val = 0;
-		spin_unlock_irqrestore(&tp->lock, flags);
+		spin_unlock_bh(&tp->lock);
 
 		tp->phy_crc_errors += val;
 
@@ -6722,11 +6699,9 @@ static void tg3_set_rx_mode(struct net_device *dev)
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 	__tg3_set_rx_mode(dev);
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 }
 
 #define TG3_REGDUMP_LEN		(32 * 1024)
@@ -6748,8 +6723,7 @@ static void tg3_get_regs(struct net_device *dev,
 
 	memset(p, 0, TG3_REGDUMP_LEN);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 #define __GET_REG32(reg)	(*(p)++ = tr32(reg))
 #define GET_REG32_LOOP(base,len)		\
@@ -6799,8 +6773,7 @@ do {	p = (u32 *)(orig_p + (reg));		\
 #undef GET_REG32_LOOP
 #undef GET_REG32_1
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 }
 
 static int tg3_get_eeprom_len(struct net_device *dev)
@@ -6976,8 +6949,7 @@ static int tg3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 			return -EINVAL;
 	}
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	tp->link_config.autoneg = cmd->autoneg;
 	if (cmd->autoneg == AUTONEG_ENABLE) {
@@ -6993,8 +6965,7 @@ static int tg3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 	if (netif_running(dev))
 		tg3_setup_phy(tp, 1);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
   
 	return 0;
 }
@@ -7030,12 +7001,12 @@ static int tg3_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 	    !(tp->tg3_flags & TG3_FLAG_SERDES_WOL_CAP))
 		return -EINVAL;
   
-	spin_lock_irq(&tp->lock);
+	spin_lock_bh(&tp->lock);
 	if (wol->wolopts & WAKE_MAGIC)
 		tp->tg3_flags |= TG3_FLAG_WOL_ENABLE;
 	else
 		tp->tg3_flags &= ~TG3_FLAG_WOL_ENABLE;
-	spin_unlock_irq(&tp->lock);
+	spin_unlock_bh(&tp->lock);
   
 	return 0;
 }
@@ -7075,7 +7046,7 @@ static int tg3_nway_reset(struct net_device *dev)
 	if (!netif_running(dev))
 		return -EAGAIN;
 
-	spin_lock_irq(&tp->lock);
+	spin_lock_bh(&tp->lock);
 	r = -EINVAL;
 	tg3_readphy(tp, MII_BMCR, &bmcr);
 	if (!tg3_readphy(tp, MII_BMCR, &bmcr) &&
@@ -7083,7 +7054,7 @@ static int tg3_nway_reset(struct net_device *dev)
 		tg3_writephy(tp, MII_BMCR, bmcr | BMCR_ANRESTART);
 		r = 0;
 	}
-	spin_unlock_irq(&tp->lock);
+	spin_unlock_bh(&tp->lock);
   
 	return r;
 }
@@ -7114,8 +7085,7 @@ static int tg3_set_ringparam(struct net_device *dev, struct ethtool_ringparam *e
 	if (netif_running(dev))
 		tg3_netif_stop(tp);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
   
 	tp->rx_pending = ering->rx_pending;
 
@@ -7131,8 +7101,7 @@ static int tg3_set_ringparam(struct net_device *dev, struct ethtool_ringparam *e
 		tg3_netif_start(tp);
 	}
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
   
 	return 0;
 }
@@ -7153,8 +7122,8 @@ static int tg3_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam
 	if (netif_running(dev))
 		tg3_netif_stop(tp);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 1);
+
 	if (epause->autoneg)
 		tp->tg3_flags |= TG3_FLAG_PAUSE_AUTONEG;
 	else
@@ -7173,8 +7142,8 @@ static int tg3_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam
 		tg3_init_hw(tp);
 		tg3_netif_start(tp);
 	}
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+
+	tg3_full_unlock(tp);
   
 	return 0;
 }
@@ -7195,12 +7164,12 @@ static int tg3_set_rx_csum(struct net_device *dev, u32 data)
   		return 0;
   	}
   
-	spin_lock_irq(&tp->lock);
+	spin_lock_bh(&tp->lock);
 	if (data)
 		tp->tg3_flags |= TG3_FLAG_RX_CHECKSUMS;
 	else
 		tp->tg3_flags &= ~TG3_FLAG_RX_CHECKSUMS;
-	spin_unlock_irq(&tp->lock);
+	spin_unlock_bh(&tp->lock);
   
 	return 0;
 }
@@ -7722,8 +7691,7 @@ static void tg3_self_test(struct net_device *dev, struct ethtool_test *etest,
 		if (netif_running(dev))
 			tg3_netif_stop(tp);
 
-		spin_lock_irq(&tp->lock);
-		spin_lock(&tp->tx_lock);
+		tg3_full_lock(tp, 1);
 
 		tg3_halt(tp, RESET_KIND_SUSPEND, 1);
 		tg3_nvram_lock(tp);
@@ -7745,14 +7713,14 @@ static void tg3_self_test(struct net_device *dev, struct ethtool_test *etest,
 			data[4] = 1;
 		}
 
-		spin_unlock(&tp->tx_lock);
-		spin_unlock_irq(&tp->lock);
+		tg3_full_unlock(tp);
+
 		if (tg3_test_interrupt(tp) != 0) {
 			etest->flags |= ETH_TEST_FL_FAILED;
 			data[5] = 1;
 		}
-		spin_lock_irq(&tp->lock);
-		spin_lock(&tp->tx_lock);
+
+		tg3_full_lock(tp, 0);
 
 		tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
 		if (netif_running(dev)) {
@@ -7760,8 +7728,8 @@ static void tg3_self_test(struct net_device *dev, struct ethtool_test *etest,
 			tg3_init_hw(tp);
 			tg3_netif_start(tp);
 		}
-		spin_unlock(&tp->tx_lock);
-		spin_unlock_irq(&tp->lock);
+
+		tg3_full_unlock(tp);
 	}
 }
 
@@ -7782,9 +7750,9 @@ static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (tp->tg3_flags2 & TG3_FLG2_PHY_SERDES)
 			break;			/* We have no PHY */
 
-		spin_lock_irq(&tp->lock);
+		spin_lock_bh(&tp->lock);
 		err = tg3_readphy(tp, data->reg_num & 0x1f, &mii_regval);
-		spin_unlock_irq(&tp->lock);
+		spin_unlock_bh(&tp->lock);
 
 		data->val_out = mii_regval;
 
@@ -7798,9 +7766,9 @@ static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (!capable(CAP_NET_ADMIN))
 			return -EPERM;
 
-		spin_lock_irq(&tp->lock);
+		spin_lock_bh(&tp->lock);
 		err = tg3_writephy(tp, data->reg_num & 0x1f, data->val_in);
-		spin_unlock_irq(&tp->lock);
+		spin_unlock_bh(&tp->lock);
 
 		return err;
 
@@ -7816,28 +7784,24 @@ static void tg3_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	tp->vlgrp = grp;
 
 	/* Update RX_MODE_KEEP_VLAN_TAG bit in RX_MODE register. */
 	__tg3_set_rx_mode(dev);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 }
 
 static void tg3_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 	if (tp->vlgrp)
 		tp->vlgrp->vlan_devices[vid] = NULL;
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 }
 #endif
 
@@ -10168,24 +10132,19 @@ static int tg3_suspend(struct pci_dev *pdev, pm_message_t state)
 
 	del_timer_sync(&tp->timer);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 1);
 	tg3_disable_ints(tp);
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	netif_device_detach(dev);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 	tg3_halt(tp, RESET_KIND_SHUTDOWN, 1);
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	err = tg3_set_power_state(tp, pci_choose_state(pdev, state));
 	if (err) {
-		spin_lock_irq(&tp->lock);
-		spin_lock(&tp->tx_lock);
+		tg3_full_lock(tp, 0);
 
 		tg3_init_hw(tp);
 
@@ -10195,8 +10154,7 @@ static int tg3_suspend(struct pci_dev *pdev, pm_message_t state)
 		netif_device_attach(dev);
 		tg3_netif_start(tp);
 
-		spin_unlock(&tp->tx_lock);
-		spin_unlock_irq(&tp->lock);
+		tg3_full_unlock(tp);
 	}
 
 	return err;
@@ -10219,8 +10177,7 @@ static int tg3_resume(struct pci_dev *pdev)
 
 	netif_device_attach(dev);
 
-	spin_lock_irq(&tp->lock);
-	spin_lock(&tp->tx_lock);
+	tg3_full_lock(tp, 0);
 
 	tg3_init_hw(tp);
 
@@ -10231,8 +10188,7 @@ static int tg3_resume(struct pci_dev *pdev)
 
 	tg3_netif_start(tp);
 
-	spin_unlock(&tp->tx_lock);
-	spin_unlock_irq(&tp->lock);
+	tg3_full_unlock(tp);
 
 	return 0;
 }

drivers/net/tg3.h

@@ -2006,17 +2006,31 @@ struct tg3_ethtool_stats {
 struct tg3 {
 	/* begin "general, frequently-used members" cacheline section */
 
+	/* If the IRQ handler (which runs lockless) needs to be
+	 * quiesced, the following bitmask state is used.  The
+	 * SYNC flag is set by non-IRQ context code to initiate
+	 * the quiescence.
+	 *
+	 * When the IRQ handler notices that SYNC is set, it
+	 * disables interrupts and returns.
+	 *
+	 * When all outstanding IRQ handlers have returned after
+	 * the SYNC flag has been set, the setter can be assured
+	 * that interrupts will no longer get run.
+	 *
+	 * In this way all SMP driver locks are never acquired
+	 * in hw IRQ context, only sw IRQ context or lower.
+	 */
+	unsigned int			irq_sync;
+
 	/* SMP locking strategy:
 	 *
 	 * lock: Held during all operations except TX packet
 	 *       processing.
 	 *
-	 * tx_lock: Held during tg3_start_xmit{,_4gbug} and tg3_tx
+	 * tx_lock: Held during tg3_start_xmit and tg3_tx
 	 *
-	 * If you want to shut up all asynchronous processing you must
-	 * acquire both locks, 'lock' taken before 'tx_lock'.  IRQs must
-	 * be disabled to take 'lock' but only softirq disabling is
-	 * necessary for acquisition of 'tx_lock'.
+	 * Both of these locks are to be held with BH safety.
 	 */
 	spinlock_t			lock;
 	spinlock_t			indirect_lock;