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xen/pciback: Don't setup an fake IRQ handler for SR-IOV devices. 

If we try to setup an fake IRQ handler for legacy interrupts
for devices that only have MSI-X (most if not all SR-IOV cards),
we will fail with this:

pciback[0000:01:10.0]: failed to install fake IRQ handler for IRQ 0! (rc:-38)

Since those cards don't have anything in dev->irq.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2011-02-16 15:43:25 -05:00
parent a0b2fa8ef8
commit e17ab35f05
1 changed files with 7 additions and 0 deletions
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7
drivers/xen/xen-pciback/pciback_ops.c
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@ -48,6 +48,13 @@ void pciback_control_isr(struct pci_dev *dev, int reset)
if (enable)
dev_data->irq = dev->irq;
/*
* SR-IOV devices in all use MSI-X and have no legacy
* interrupts, so inhibit creating a fake IRQ handler for them.
*/
if (dev_data->irq == 0)
goto out;
dev_dbg(&dev->dev, "%s: #%d %s %s%s %s-> %s\n",
dev_data->irq_name,
dev_data->irq,