r8169: issue request_irq after the private data are completely initialized

The irq handler schedules a NAPI poll request unconditionally as soon as
the status register is not clean. It has been there - and wrong - for
ages but a recent timing change made it apparently easier to trigger.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Jay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index 521b5f0618a4a904a4d736d2263a6573eb9dbd5e..60f630e84bf08f97cae7a4b7de4ddf43769d1620 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -66,6 +66,7 @@ VERSION 2.2LK <2005/01/25>
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
 
+#include <asm/system.h>
 #include <asm/io.h>
 #include <asm/irq.h>
 
@@ -486,6 +487,7 @@ static int rtl8169_rx_interrupt(struct net_device *, struct rtl8169_private *,
                                void __iomem *);
 static int rtl8169_change_mtu(struct net_device *dev, int new_mtu);
 static void rtl8169_down(struct net_device *dev);
+static void rtl8169_rx_clear(struct rtl8169_private *tp);
 
 #ifdef CONFIG_R8169_NAPI
 static int rtl8169_poll(struct net_device *dev, int *budget);
@@ -1751,16 +1753,10 @@ static int rtl8169_open(struct net_device *dev)
 {
        struct rtl8169_private *tp = netdev_priv(dev);
        struct pci_dev *pdev = tp->pci_dev;
-       int retval;
+       int retval = -ENOMEM;
 
-       rtl8169_set_rxbufsize(tp, dev);
-
-       retval =
-           request_irq(dev->irq, rtl8169_interrupt, IRQF_SHARED, dev->name, dev);
-       if (retval < 0)
-               goto out;
 
-       retval = -ENOMEM;
+       rtl8169_set_rxbufsize(tp, dev);
 
        /*
         * Rx and Tx desscriptors needs 256 bytes alignment.
@@ -1769,19 +1765,26 @@ static int rtl8169_open(struct net_device *dev)
        tp->TxDescArray = pci_alloc_consistent(pdev, R8169_TX_RING_BYTES,
                                               &tp->TxPhyAddr);
        if (!tp->TxDescArray)
-               goto err_free_irq;
+               goto out;
 
        tp->RxDescArray = pci_alloc_consistent(pdev, R8169_RX_RING_BYTES,
                                               &tp->RxPhyAddr);
        if (!tp->RxDescArray)
-               goto err_free_tx;
+               goto err_free_tx_0;
 
        retval = rtl8169_init_ring(dev);
        if (retval < 0)
-               goto err_free_rx;
+               goto err_free_rx_1;
 
        INIT_DELAYED_WORK(&tp->task, NULL);
 
+       smp_mb();
+
+       retval = request_irq(dev->irq, rtl8169_interrupt, IRQF_SHARED,
+                            dev->name, dev);
+       if (retval < 0)
+               goto err_release_ring_2;
+
        rtl8169_hw_start(dev);
 
        rtl8169_request_timer(dev);
@@ -1790,14 +1793,14 @@ static int rtl8169_open(struct net_device *dev)
 out:
        return retval;
 
-err_free_rx:
+err_release_ring_2:
+       rtl8169_rx_clear(tp);
+err_free_rx_1:
        pci_free_consistent(pdev, R8169_RX_RING_BYTES, tp->RxDescArray,
                            tp->RxPhyAddr);
-err_free_tx:
+err_free_tx_0:
        pci_free_consistent(pdev, R8169_TX_RING_BYTES, tp->TxDescArray,
                            tp->TxPhyAddr);
-err_free_irq:
-       free_irq(dev->irq, dev);
        goto out;
 }