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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-09-26 12:22:01 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-09-27 00:48:34 -0400 |
| commit | cf177fd049d6248b8c594bd7fa3ba56313f7d405 (patch) | |
| tree | c3dc97c73812268fbcb4961b668610ae626ed10f /drivers/xen | |
| parent | 2aefcad8666e0c7c1aff51c0dacc164a1b681895 (diff) | |
| download | lwn-cf177fd049d6248b8c594bd7fa3ba56313f7d405.tar.gz lwn-cf177fd049d6248b8c594bd7fa3ba56313f7d405.zip | |
xen/pciback: Add flag indicating device has been assigned by Xen
Device drivers that create and destroy SR-IOV virtual functions via
calls to pci_enable_sriov() and pci_disable_sriov can cause catastrophic
failures if they attempt to destroy VFs while they are assigned to
guest virtual machines. By adding a flag for use by the Xen PCI back
to indicate that a device is assigned a device driver can check that
flag and avoid destroying VFs while they are assigned and avoid system
failures.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xen-pciback/xenbus.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c index 978d2c6f5dca..18db31f13a4c 100644 --- a/drivers/xen/xen-pciback/xenbus.c +++ b/drivers/xen/xen-pciback/xenbus.c @@ -249,6 +249,7 @@ static int xen_pcibk_export_device(struct xen_pcibk_device *pdev, goto out; dev_dbg(&dev->dev, "registering for %d\n", pdev->xdev->otherend_id); + dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED; if (xen_register_device_domain_owner(dev, pdev->xdev->otherend_id) != 0) { dev_err(&dev->dev, "device has been assigned to another " \ @@ -288,6 +289,7 @@ static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev, } dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id); + dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; xen_unregister_device_domain_owner(dev); xen_pcibk_release_pci_dev(pdev, dev); |