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xen/pciback: Disable MSI/MSI-X when reseting a device

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In cases where the guest is abruptly killed and has not disabled
MSI/MSI-X interrupts we want to do it for it.

Otherwise when the guest is started up and enables MSI, we would
get a WARN() that the device already had been enabled.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2010-03-03 13:38:43 -05:00
parent fd5b221b34
commit a2be65fd36
1 changed files with 8 additions and 0 deletions
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8
drivers/xen/xen-pciback/pciback_ops.c
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@ -23,6 +23,14 @@ void pciback_reset_device(struct pci_dev *dev)
/* Disable devices (but not bridges) */
if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
#ifdef CONFIG_PCI_MSI
/* The guest could have been abruptly killed without
* disabling MSI/MSI-X interrupts.*/
if (dev->msix_enabled)
pci_disable_msix(dev);
if (dev->msi_enabled)
pci_disable_msi(dev);
#endif
pci_disable_device(dev);
pci_write_config_word(dev, PCI_COMMAND, 0);