forcedeth msi bugfix

pci_enable_msi() replaces the INTx irq number in pci_dev->irq with the
new MSI irq number.
The forcedeth driver did not update the copy in netdevice->irq and
parts of the driver used the stale copy.
See bugzilla.kernel.org, bug 9047.

The patch
- updates netdevice->irq
- replaces all accesses to netdevice->irq with pci_dev->irq.

The patch is against 2.6.23.1. IMHO suitable for both 2.6.23 and 2.6.24

Signed-Off-By: Manfred Spraul <manfred@colorfullife.com>

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index d0bff8a87666..70ddf1acfd88 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -992,7 +992,7 @@ static void nv_enable_irq(struct net_device *dev)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        enable_irq(dev->irq);
+                        enable_irq(np->pci_dev->irq);
         } else {
                 enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
                 enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
@@ -1008,7 +1008,7 @@ static void nv_disable_irq(struct net_device *dev)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        disable_irq(dev->irq);
+                        disable_irq(np->pci_dev->irq);
         } else {
                 disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
                 disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_TX].vector);
@@ -1607,7 +1607,7 @@ static void nv_do_rx_refill(unsigned long data)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        disable_irq(dev->irq);
+                        disable_irq(np->pci_dev->irq);
         } else {
                 disable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
         }
@@ -1625,7 +1625,7 @@ static void nv_do_rx_refill(unsigned long data)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        enable_irq(dev->irq);
+                        enable_irq(np->pci_dev->irq);
         } else {
                 enable_irq(np->msi_x_entry[NV_MSI_X_VECTOR_RX].vector);
         }
@@ -3560,10 +3560,12 @@ static int nv_request_irq(struct net_device *dev, int intr_test)
         if (ret != 0 && np->msi_flags & NV_MSI_CAPABLE) {
                 if ((ret = pci_enable_msi(np->pci_dev)) == 0) {
                         np->msi_flags |= NV_MSI_ENABLED;
+                        dev->irq = np->pci_dev->irq;
                         if (request_irq(np->pci_dev->irq, handler, IRQF_SHARED, dev->name, dev) != 0) {
                                 printk(KERN_INFO "forcedeth: request_irq failed %d\n", ret);
                                 pci_disable_msi(np->pci_dev);
                                 np->msi_flags &= ~NV_MSI_ENABLED;
+                                dev->irq = np->pci_dev->irq;
                                 goto out_err;
                         }
 
@@ -3626,7 +3628,7 @@ static void nv_do_nic_poll(unsigned long data)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         disable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        disable_irq_lockdep(dev->irq);
+                        disable_irq_lockdep(np->pci_dev->irq);
                 mask = np->irqmask;
         } else {
                 if (np->nic_poll_irq & NVREG_IRQ_RX_ALL) {
@@ -3644,6 +3646,8 @@ static void nv_do_nic_poll(unsigned long data)
         }
         np->nic_poll_irq = 0;
 
+        /* disable_irq() contains synchronize_irq, thus no irq handler can run now */
+
         if (np->recover_error) {
                 np->recover_error = 0;
                 printk(KERN_INFO "forcedeth: MAC in recoverable error state\n");
@@ -3680,7 +3684,6 @@ static void nv_do_nic_poll(unsigned long data)
                 }
         }
 
-        /* FIXME: Do we need synchronize_irq(dev->irq) here? */
 
         writel(mask, base + NvRegIrqMask);
         pci_push(base);
@@ -3693,7 +3696,7 @@ static void nv_do_nic_poll(unsigned long data)
                 if (np->msi_flags & NV_MSI_X_ENABLED)
                         enable_irq_lockdep(np->msi_x_entry[NV_MSI_X_VECTOR_ALL].vector);
                 else
-                        enable_irq_lockdep(dev->irq);
+                        enable_irq_lockdep(np->pci_dev->irq);
         } else {
                 if (np->nic_poll_irq & NVREG_IRQ_RX_ALL) {
                         nv_nic_irq_rx(0, dev);
@@ -4950,7 +4953,7 @@ static int nv_close(struct net_device *dev)
 #ifdef CONFIG_FORCEDETH_NAPI
         napi_disable(&np->napi);
 #endif
-        synchronize_irq(dev->irq);
+        synchronize_irq(np->pci_dev->irq);
 
         del_timer_sync(&np->oom_kick);
         del_timer_sync(&np->nic_poll);