1 files changed, 11 insertions, 17 deletions

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index a174e616eda5..eea418124be1 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -36,6 +36,7 @@
 #include <linux/ip.h>
 #include <linux/tcp.h>
 #include <linux/workqueue.h>
+#include <linux/prefetch.h>
 
 #include <net/checksum.h>
 
@@ -3278,8 +3279,9 @@ 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;
 
+        prefetch(tp->hw_status);
+        prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]);
         /*
          * Writing any value to intr-mbox-0 clears PCI INTA# and
          * chip-internal interrupt pending events.
@@ -3288,19 +3290,9 @@ static irqreturn_t tg3_msi(int irq, void *dev_id, struct pt_regs *regs)
          * event coalescing.
          */
         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)))
+        if (likely(!tg3_irq_sync(tp)))
                 netif_rx_schedule(dev);         /* schedule NAPI poll */
-        else {
-                /* No work, re-enable interrupts.  */
-                tw32_mailbox(MAILBOX_INTERRUPT_0 + TG3_64BIT_REG_LOW,
-                             tp->last_tag << 24);
-        }
-out:
+
         return IRQ_RETVAL(1);
 }
 
@@ -3330,9 +3322,10 @@ static irqreturn_t tg3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
                 if (tg3_irq_sync(tp))
                         goto out;
                 sblk->status &= ~SD_STATUS_UPDATED;
-                if (likely(tg3_has_work(tp)))
+                if (likely(tg3_has_work(tp))) {
+                        prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]);
                         netif_rx_schedule(dev);         /* schedule NAPI poll */
-                else {
+                } else {
                         /* No work, shared interrupt perhaps?  re-enable
                          * interrupts, and flush that PCI write
                          */
@@ -3374,9 +3367,10 @@ static irqreturn_t tg3_interrupt_tagged(int irq, void *dev_id, struct pt_regs *r
                 if (tg3_irq_sync(tp))
                         goto out;
                 sblk->status &= ~SD_STATUS_UPDATED;
-                if (likely(tg3_has_work(tp)))
+                if (likely(tg3_has_work(tp))) {
+                        prefetch(&tp->rx_rcb[tp->rx_rcb_ptr]);
                         netif_rx_schedule(dev);         /* schedule NAPI poll */
-                else {
+                } else {
                         /* no work, shared interrupt perhaps?  re-enable
                          * interrupts, and flush that PCI write
                          */