Merge gregkh@master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

2 files changed, 31 insertions, 28 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 6f97962dd06b..eafabb253f08 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -68,8 +68,8 @@
 
 #define DRV_MODULE_NAME         "tg3"
 #define PFX DRV_MODULE_NAME     ": "
-#define DRV_MODULE_VERSION      "3.64"
-#define DRV_MODULE_RELDATE      "July 31, 2006"
+#define DRV_MODULE_VERSION      "3.65"
+#define DRV_MODULE_RELDATE      "August 07, 2006"
 
 #define TG3_DEF_MAC_MODE        0
 #define TG3_DEF_RX_MODE         0
@@ -123,9 +123,6 @@
                                    TG3_RX_RCB_RING_SIZE(tp))
 #define TG3_TX_RING_BYTES       (sizeof(struct tg3_tx_buffer_desc) * \
                                  TG3_TX_RING_SIZE)
-#define TX_BUFFS_AVAIL(TP)                                              \
-        ((TP)->tx_pending -                                             \
-         (((TP)->tx_prod - (TP)->tx_cons) & (TG3_TX_RING_SIZE - 1)))
 #define NEXT_TX(N)              (((N) + 1) & (TG3_TX_RING_SIZE - 1))
 
 #define RX_PKT_BUF_SZ           (1536 + tp->rx_offset + 64)
@@ -2987,6 +2984,13 @@ static void tg3_tx_recover(struct tg3 *tp)
         spin_unlock(&tp->lock);
 }
 
+static inline u32 tg3_tx_avail(struct tg3 *tp)
+{
+        smp_mb();
+        return (tp->tx_pending -
+                ((tp->tx_prod - tp->tx_cons) & (TG3_TX_RING_SIZE - 1)));
+}
+
 /* Tigon3 never reports partial packet sends.  So we do not
  * need special logic to handle SKBs that have not had all
  * of their frags sent yet, like SunGEM does.
@@ -3038,12 +3042,20 @@ static void tg3_tx(struct tg3 *tp)
 
         tp->tx_cons = sw_idx;
 
-        if (unlikely(netif_queue_stopped(tp->dev))) {
-                spin_lock(&tp->tx_lock);
+        /* Need to make the tx_cons update visible to tg3_start_xmit()
+         * before checking for netif_queue_stopped().  Without the
+         * memory barrier, there is a small possibility that tg3_start_xmit()
+         * will miss it and cause the queue to be stopped forever.
+         */
+        smp_mb();
+
+        if (unlikely(netif_queue_stopped(tp->dev) &&
+                     (tg3_tx_avail(tp) > TG3_TX_WAKEUP_THRESH))) {
+                netif_tx_lock(tp->dev);
                 if (netif_queue_stopped(tp->dev) &&
-                    (TX_BUFFS_AVAIL(tp) > TG3_TX_WAKEUP_THRESH))
+                    (tg3_tx_avail(tp) > TG3_TX_WAKEUP_THRESH))
                         netif_wake_queue(tp->dev);
-                spin_unlock(&tp->tx_lock);
+                netif_tx_unlock(tp->dev);
         }
 }
 
@@ -3101,7 +3113,6 @@ static int tg3_alloc_rx_skb(struct tg3 *tp, u32 opaque_key,
         if (skb == NULL)
                 return -ENOMEM;
 
-        skb->dev = tp->dev;
         skb_reserve(skb, tp->rx_offset);
 
         mapping = pci_map_single(tp->pdev, skb->data,
@@ -3274,7 +3285,6 @@ static int tg3_rx(struct tg3 *tp, int budget)
                         if (copy_skb == NULL)
                                 goto drop_it_no_recycle;
 
-                        copy_skb->dev = tp->dev;
                         skb_reserve(copy_skb, 2);
                         skb_put(copy_skb, len);
                         pci_dma_sync_single_for_cpu(tp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE);
@@ -3797,7 +3807,7 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
          * interrupt.  Furthermore, IRQ processing runs lockless so we have
          * no IRQ context deadlocks to worry about either.  Rejoice!
          */
-        if (unlikely(TX_BUFFS_AVAIL(tp) <= (skb_shinfo(skb)->nr_frags + 1))) {
+        if (unlikely(tg3_tx_avail(tp) <= (skb_shinfo(skb)->nr_frags + 1))) {
                 if (!netif_queue_stopped(dev)) {
                         netif_stop_queue(dev);
 
@@ -3893,12 +3903,10 @@ static int tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
         tw32_tx_mbox((MAILBOX_SNDHOST_PROD_IDX_0 + TG3_64BIT_REG_LOW), entry);
 
         tp->tx_prod = entry;
-        if (unlikely(TX_BUFFS_AVAIL(tp) <= (MAX_SKB_FRAGS + 1))) {
-                spin_lock(&tp->tx_lock);
+        if (unlikely(tg3_tx_avail(tp) <= (MAX_SKB_FRAGS + 1))) {
                 netif_stop_queue(dev);
-                if (TX_BUFFS_AVAIL(tp) > TG3_TX_WAKEUP_THRESH)
+                if (tg3_tx_avail(tp) > TG3_TX_WAKEUP_THRESH)
                         netif_wake_queue(tp->dev);
-                spin_unlock(&tp->tx_lock);
         }
 
 out_unlock:
@@ -3920,7 +3928,7 @@ static int tg3_tso_bug(struct tg3 *tp, struct sk_buff *skb)
         struct sk_buff *segs, *nskb;
 
         /* Estimate the number of fragments in the worst case */
-        if (unlikely(TX_BUFFS_AVAIL(tp) <= (skb_shinfo(skb)->gso_segs * 3))) {
+        if (unlikely(tg3_tx_avail(tp) <= (skb_shinfo(skb)->gso_segs * 3))) {
                 netif_stop_queue(tp->dev);
                 return NETDEV_TX_BUSY;
         }
@@ -3960,7 +3968,7 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
          * interrupt.  Furthermore, IRQ processing runs lockless so we have
          * no IRQ context deadlocks to worry about either.  Rejoice!
          */
-        if (unlikely(TX_BUFFS_AVAIL(tp) <= (skb_shinfo(skb)->nr_frags + 1))) {
+        if (unlikely(tg3_tx_avail(tp) <= (skb_shinfo(skb)->nr_frags + 1))) {
                 if (!netif_queue_stopped(dev)) {
                         netif_stop_queue(dev);
 
@@ -4110,12 +4118,10 @@ static int tg3_start_xmit_dma_bug(struct sk_buff *skb, struct net_device *dev)
         tw32_tx_mbox((MAILBOX_SNDHOST_PROD_IDX_0 + TG3_64BIT_REG_LOW), entry);
 
         tp->tx_prod = entry;
-        if (unlikely(TX_BUFFS_AVAIL(tp) <= (MAX_SKB_FRAGS + 1))) {
-                spin_lock(&tp->tx_lock);
+        if (unlikely(tg3_tx_avail(tp) <= (MAX_SKB_FRAGS + 1))) {
                 netif_stop_queue(dev);
-                if (TX_BUFFS_AVAIL(tp) > TG3_TX_WAKEUP_THRESH)
+                if (tg3_tx_avail(tp) > TG3_TX_WAKEUP_THRESH)
                         netif_wake_queue(tp->dev);
-                spin_unlock(&tp->tx_lock);
         }
 
 out_unlock:
@@ -11474,7 +11480,6 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
         tp->grc_mode |= GRC_MODE_BSWAP_NONFRM_DATA;
 #endif
         spin_lock_init(&tp->lock);
-        spin_lock_init(&tp->tx_lock);
         spin_lock_init(&tp->indirect_lock);
         INIT_WORK(&tp->reset_task, tg3_reset_task, tp);
 
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index ba2c98711c88..3ecf356cfb08 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2079,9 +2079,9 @@ struct tg3 {
          * lock: Held during reset, PHY access, timer, and when
          *       updating tg3_flags and tg3_flags2.
          *
-         * tx_lock: Held during tg3_start_xmit and tg3_tx only
-         *          when calling netif_[start|stop]_queue.
-         *          tg3_start_xmit is protected by netif_tx_lock.
+         * netif_tx_lock: Held during tg3_start_xmit. tg3_tx holds
+         *                netif_tx_lock when it needs to call
+         *                netif_wake_queue.
          *
          * Both of these locks are to be held with BH safety.
          *
@@ -2118,8 +2118,6 @@ struct tg3 {
         u32                             tx_cons;
         u32                             tx_pending;
 
-        spinlock_t                      tx_lock;
-
         struct tg3_tx_buffer_desc       *tx_ring;
         struct tx_ring_info             *tx_buffers;
         dma_addr_t                      tx_desc_mapping;