From 8dc0b54bc7e4d14efdd0314a9d9e3960a230d527 Mon Sep 17 00:00:00 2001 From: Daniel Barkalow Date: Fri, 8 Dec 2006 11:58:15 -0500 Subject: [PATCH] [PATCH] forcedeth: Disable INTx when enabling MSI in forcedeth At least some nforce cards continue to send legacy interrupts when MSI is enabled, and these interrupts are treated as unhandled by the kernel. This patch disables legacy interrupts explicitly when enabling MSI mode. The correct fix is to change the MSI infrastructure to disable legacy interrupts when enabling MSI, but this is potentially risky if the device isn't PCI-2.3 or is quirky, so the correct fix is going into mainline, while patches like this one go into -stable. Legend has it that it is most correct to disable legacy interrupts before enabling MSI, but the mainline patch does it in the other order, and this patch is "obviously" the same as mainline. Signed-off-by: Daniel Barkalow Signed-off-by: Chris Wright --- drivers/net/forcedeth.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c index 11b8f1b43dd5..bacd25f452a9 100644 --- a/drivers/net/forcedeth.c +++ b/drivers/net/forcedeth.c @@ -2692,11 +2692,13 @@ 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) { + pci_intx(np->pci_dev, 0); np->msi_flags |= NV_MSI_ENABLED; if ((!intr_test && request_irq(np->pci_dev->irq, &nv_nic_irq, IRQF_SHARED, dev->name, dev) != 0) || (intr_test && request_irq(np->pci_dev->irq, &nv_nic_irq_test, IRQF_SHARED, dev->name, dev) != 0)) { printk(KERN_INFO "forcedeth: request_irq failed %d\n", ret); pci_disable_msi(np->pci_dev); + pci_intx(np->pci_dev, 1); np->msi_flags &= ~NV_MSI_ENABLED; goto out_err; } @@ -2739,6 +2741,7 @@ static void nv_free_irq(struct net_device *dev) free_irq(np->pci_dev->irq, dev); if (np->msi_flags & NV_MSI_ENABLED) { pci_disable_msi(np->pci_dev); + pci_intx(np->pci_dev, 1); np->msi_flags &= ~NV_MSI_ENABLED; } } -- 2.39.5