netdev - [PATCH] skge: use unique IRQ name

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Date:	Thu, 1 Oct 2009 12:27:20 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] 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@...0:00:0a.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@...hat.com>

Index: kernel/drivers/net/skge.c
===================================================================
--- kernel.orig/drivers/net/skge.c
+++ kernel/drivers/net/skge.c
@@ -3895,6 +3895,7 @@ static int __devinit skge_probe(struct p
 	struct net_device *dev, *dev1;
 	struct skge_hw *hw;
 	int err, using_dac = 0;
+	size_t irq_name_len;

 	err = pci_enable_device(pdev);
 	if (err) {
@@ -3935,11 +3936,13 @@ static int __devinit skge_probe(struct p
 #endif

 	err = -ENOMEM;
-	hw = kzalloc(sizeof(*hw), GFP_KERNEL);
+	irq_name_len = strlen(DRV_NAME) + strlen(dev_name(&pdev->dev)) + 2;
+	hw = kzalloc(sizeof(*hw) + irq_name_len, GFP_KERNEL);
 	if (!hw) {
 		dev_err(&pdev->dev, "cannot allocate hardware struct\n");
 		goto err_out_free_regions;
 	}
+	sprintf(hw->irq_name, DRV_NAME "@%s", dev_name(&pdev->dev));

 	hw->pdev = pdev;
 	spin_lock_init(&hw->hw_lock);
@@ -3974,7 +3977,7 @@ static int __devinit skge_probe(struct p
 		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);
Index: kernel/drivers/net/skge.h
===================================================================
--- kernel.orig/drivers/net/skge.h
+++ kernel/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]; /* name for /proc/interrupts */
 };

 enum pause_control {
--
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