sky2: backout NAPI reschedule

This is a backout of earlier patch.

The whole rescheduling hack was a bad idea. It doesn't really solve
the problem and it makes the code more complicated for no good reason.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 227df98..76da74f 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2105,7 +2105,6 @@ static int sky2_poll(struct net_device *dev0, int *budget)
        int work_done = 0;
        u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
 
- restart_poll:
        if (unlikely(status & ~Y2_IS_STAT_BMU)) {
                if (status & Y2_IS_HW_ERR)
                        sky2_hw_intr(hw);
@@ -2136,7 +2135,7 @@ static int sky2_poll(struct net_device *dev0, int *budget)
        }
 
        if (status & Y2_IS_STAT_BMU) {
-               work_done += sky2_status_intr(hw, work_limit - work_done);
+               work_done = sky2_status_intr(hw, work_limit);
                *budget -= work_done;
                dev0->quota -= work_done;
 
@@ -2148,22 +2147,9 @@ static int sky2_poll(struct net_device *dev0, int *budget)
 
        mod_timer(&hw->idle_timer, jiffies + HZ);
 
-       local_irq_disable();
-       __netif_rx_complete(dev0);
+       netif_rx_complete(dev0);
 
        status = sky2_read32(hw, B0_Y2_SP_LISR);
-
-       if (unlikely(status)) {
-               /* More work pending, try and keep going */
-               if (__netif_rx_schedule_prep(dev0)) {
-                       __netif_rx_reschedule(dev0, work_done);
-                       status = sky2_read32(hw, B0_Y2_SP_EISR);
-                       local_irq_enable();
-                       goto restart_poll;
-               }
-       }
-
-       local_irq_enable();
        return 0;
 }
 
@@ -2181,6 +2167,8 @@ static irqreturn_t sky2_intr(int irq, void *dev_id, struct pt_regs *regs)
        prefetch(&hw->st_le[hw->st_idx]);
        if (likely(__netif_rx_schedule_prep(dev0)))
                __netif_rx_schedule(dev0);
+       else
+               printk(KERN_DEBUG PFX "irq race detected\n");
 
        return IRQ_HANDLED;
 }

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 309f919..a461b51 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -831,21 +831,19 @@ static inline void netif_rx_schedule(struct net_device *dev)
                __netif_rx_schedule(dev);
 }
 
-
-static inline void  __netif_rx_reschedule(struct net_device *dev, int undo)
-{
-       dev->quota += undo;
-       list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
-       __raise_softirq_irqoff(NET_RX_SOFTIRQ);
-}
-
-/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete(). */
+/* Try to reschedule poll. Called by dev->poll() after netif_rx_complete().
+ * Do not inline this?
+ */
 static inline int netif_rx_reschedule(struct net_device *dev, int undo)
 {
        if (netif_rx_schedule_prep(dev)) {
                unsigned long flags;
+
+               dev->quota += undo;
+
                local_irq_save(flags);
-               __netif_rx_reschedule(dev, undo);
+               list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
+               __raise_softirq_irqoff(NET_RX_SOFTIRQ);
                local_irq_restore(flags);
                return 1;
        }