From: Konrad Rzeszutek Wilk Date: Mon, 26 Sep 2011 16:22:01 +0000 (-0400) Subject: xen/pciback: Add flag indicating device has been assigned by Xen X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cf177fd049d6248b8c594bd7fa3ba56313f7d405;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Signed-off-by: David S. Miller --- 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);