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| author | Michal Schmidt <mschmidt@redhat.com> | 2009-10-01 08:13:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-01 15:14:54 -0700 |
| commit | 415e69e6574ab740e5db56152055eb899e7ac86e (patch) | |
| tree | 970ca864f2187dbd3a32164f44eb5f9e2ac24af5 | |
| parent | 89e95a613c8a045ce0c5b992ba19f10613f6ab2f (diff) | |
| download | linux-3.10-415e69e6574ab740e5db56152055eb899e7ac86e.tar.gz linux-3.10-415e69e6574ab740e5db56152055eb899e7ac86e.tar.bz2 linux-3.10-415e69e6574ab740e5db56152055eb899e7ac86e.zip | |
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>
| -rw-r--r-- | drivers/net/skge.c | 7 | ||||
| -rw-r--r-- | drivers/net/skge.h | 2 |
2 files changed, 7 insertions, 2 deletions
diff --git a/drivers/net/skge.c b/drivers/net/skge.c index 2bb21ffbde3..01f6811f132 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); diff --git a/drivers/net/skge.h b/drivers/net/skge.h index 17caccbb768..831de1b6e96 100644 --- a/drivers/net/skge.h +++ b/drivers/net/skge.h @@ -2423,6 +2423,8 @@ struct skge_hw { u16 phy_addr; spinlock_t phy_lock; struct tasklet_struct phy_task; + + char irq_name[0]; /* skge@pci:000:04:00.0 */ }; enum pause_control { |