[PATCH] sky2: reschedule if irq still pending

This is a workaround for the case edge-triggered irq's. Several users
seem to have broken configurations sharing edge-triggered irq's. To avoid
losing IRQ's, reshedule if more work arrives.

The changes to netdevice.h are to extract the part that puts device
back in list into separate inline.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 67b0eab16589..618fde8622ca 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2093,6 +2093,7 @@ 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);
@@ -2123,7 +2124,7 @@ 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 += sky2_status_intr(hw, work_limit - work_done);
                 *budget -= work_done;
                 dev0->quota -= work_done;
 
@@ -2133,9 +2134,22 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                 sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
         }
 
-        netif_rx_complete(dev0);
+        local_irq_disable();
+        __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;
 }
 
@@ -2153,8 +2167,6 @@ 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;
 }