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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-09-26 12:22:01 -0400
committerDavid S. Miller <davem@davemloft.net>2011-09-27 00:48:34 -0400
commitcf177fd049d6248b8c594bd7fa3ba56313f7d405 (patch)
treec3dc97c73812268fbcb4961b668610ae626ed10f
parent2aefcad8666e0c7c1aff51c0dacc164a1b681895 (diff)
downloadlwn-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>
-rw-r--r--drivers/xen/xen-pciback/xenbus.c2
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);