[PATCH] sky2: add fake idle irq timer

Add an fake NAPI schedule once a second. This is an attempt to work around
for broken configurations with edge-triggered interrupts.

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

2 files changed, 23 insertions, 1 deletions

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 618fde8622ca..6673ddf763a4 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2086,6 +2086,20 @@ static void sky2_descriptor_error(struct sky2_hw *hw, unsigned port,
         }
 }
 
+/* If idle then force a fake soft NAPI poll once a second
+ * to work around cases where sharing an edge triggered interrupt.
+ */
+static void sky2_idle(unsigned long arg)
+{
+        struct net_device *dev = (struct net_device *) arg;
+
+        local_irq_disable();
+        if (__netif_rx_schedule_prep(dev))
+                __netif_rx_schedule(dev);
+        local_irq_enable();
+}
+
+
 static int sky2_poll(struct net_device *dev0, int *budget)
 {
         struct sky2_hw *hw = ((struct sky2_port *) netdev_priv(dev0))->hw;
@@ -2134,6 +2148,8 @@ static int sky2_poll(struct net_device *dev0, int *budget)
                 sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
         }
 
+        mod_timer(&hw->idle_timer, jiffies + HZ);
+
         local_irq_disable();
         __netif_rx_complete(dev0);
 
@@ -3288,6 +3304,8 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
 
         sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
 
+        setup_timer(&hw->idle_timer, sky2_idle, (unsigned long) dev);
+
         pci_set_drvdata(pdev, hw);
 
         return 0;
@@ -3323,13 +3341,15 @@ static void __devexit sky2_remove(struct pci_dev *pdev)
         if (!hw)
                 return;
 
+        del_timer_sync(&hw->idle_timer);
+
+        sky2_write32(hw, B0_IMSK, 0);
         dev0 = hw->dev[0];
         dev1 = hw->dev[1];
         if (dev1)
                 unregister_netdev(dev1);
         unregister_netdev(dev0);
 
-        sky2_write32(hw, B0_IMSK, 0);
         sky2_set_power_state(hw, PCI_D3hot);
         sky2_write16(hw, B0_Y2LED, LED_STAT_OFF);
         sky2_write8(hw, B0_CTST, CS_RST_SET);
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 89dd18cd12f0..b026f5653f04 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -1880,6 +1880,8 @@ struct sky2_hw {
         struct sky2_status_le *st_le;
         u32                  st_idx;
         dma_addr_t           st_dma;
+
+        struct timer_list    idle_timer;
         int                  msi_detected;
         wait_queue_head_t    msi_wait;
 };