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authorMichal Schmidt <mschmidt@redhat.com>2009-10-01 08:13:23 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-01 15:14:54 -0700
commit415e69e6574ab740e5db56152055eb899e7ac86e (patch)
tree970ca864f2187dbd3a32164f44eb5f9e2ac24af5 /drivers/net/skge.c
parent89e95a613c8a045ce0c5b992ba19f10613f6ab2f (diff)
downloadop-kernel-dev-415e69e6574ab740e5db56152055eb899e7ac86e.zip
op-kernel-dev-415e69e6574ab740e5db56152055eb899e7ac86e.tar.gz
skge: use unique IRQ name
Most network drivers request their IRQ when the interface is activated. skge does it in ->probe() instead, because it can work with two-port cards where the two net_devices use the same IRQ. This works fine most of the time, except in some situations when the interface gets renamed. Consider this example: 1. modprobe skge The card is detected as eth0 and requests IRQ 17. Directory /proc/irq/17/eth0 is created. 2. There is an udev rule which says this interface should be called eth1, so udev renames eth0 -> eth1. 3. modprobe 8139too The Realtek card is detected as eth0. It will be using IRQ 17 too. 4. ip link set eth0 up Now 8139too requests IRQ 17. The result is: WARNING: at fs/proc/generic.c:590 proc_register ... proc_dir_entry '17/eth0' already registered ... And "ls /proc/irq/17" shows two subdirectories, both called eth0. Fix it by using a unique name for skge's IRQ, based on the PCI address. The naming from the example then looks like this: $ grep skge /proc/interrupts 17: 169 IO-APIC-fasteoi skge@pci:0000:00:0a.0, eth0 irqbalance daemon will have to be taught to recognize "skge@" as an Ethernet interrupt. This will be a one-liner addition in classify.c. I will send a patch to irqbalance if this change is accepted. Signed-off-by: Michal Schmidt <mschmidt@redhat.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/skge.c')
-rw-r--r--drivers/net/skge.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 2bb21ff..01f6811 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -3935,11 +3935,14 @@ static int __devinit skge_probe(struct pci_dev *pdev,
#endif
err = -ENOMEM;
- hw = kzalloc(sizeof(*hw), GFP_KERNEL);
+ /* space for skge@pci:0000:04:00.0 */
+ hw = kzalloc(sizeof(*hw) + strlen(DRV_NAME "@pci:" )
+ + strlen(pci_name(pdev)) + 1, GFP_KERNEL);
if (!hw) {
dev_err(&pdev->dev, "cannot allocate hardware struct\n");
goto err_out_free_regions;
}
+ sprintf(hw->irq_name, DRV_NAME "@pci:%s", pci_name(pdev));
hw->pdev = pdev;
spin_lock_init(&hw->hw_lock);
@@ -3974,7 +3977,7 @@ static int __devinit skge_probe(struct pci_dev *pdev,
goto err_out_free_netdev;
}
- err = request_irq(pdev->irq, skge_intr, IRQF_SHARED, dev->name, hw);
+ err = request_irq(pdev->irq, skge_intr, IRQF_SHARED, hw->irq_name, hw);
if (err) {
dev_err(&pdev->dev, "%s: cannot assign irq %d\n",
dev->name, pdev->irq);
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