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authorDavid Vrabel <david.vrabel@citrix.com>2012-10-18 11:03:36 +0100
committerBjorn Helgaas <bhelgaas@google.com>2012-11-30 14:33:35 -0700
commitd5af64de2d1cc87d77ac7c0e90d89630a37a4f09 (patch)
treed1fe66a02d41848614c39adde978ca1fcd08cf25 /drivers/pci/xen-pcifront.c
parent918b4053184c0ca22236e70e299c5343eea35304 (diff)
xen-pcifront: Handle backend CLOSED without CLOSING
Backend drivers shouldn't transition to CLOSED unless the frontend is CLOSED. If a backend does transition to CLOSED too soon then the frontend may not see the CLOSING state and will not properly shutdown. So, treat an unexpected backend CLOSED state the same as CLOSING. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/pci/xen-pcifront.c')
-rw-r--r--drivers/pci/xen-pcifront.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
index 0aab85a5155..a0c73120b26 100644
--- a/drivers/pci/xen-pcifront.c
+++ b/drivers/pci/xen-pcifront.c
@@ -1068,13 +1068,16 @@ static void __init_refok pcifront_backend_changed(struct xenbus_device *xdev,
case XenbusStateInitialising:
case XenbusStateInitWait:
case XenbusStateInitialised:
- case XenbusStateClosed:
break;
case XenbusStateConnected:
pcifront_try_connect(pdev);
break;
+ case XenbusStateClosed:
+ if (xdev->state == XenbusStateClosed)
+ break;
+ /* Missed the backend's CLOSING state -- fallthrough */
case XenbusStateClosing:
dev_warn(&xdev->dev, "backend going away!\n");
pcifront_try_disconnect(pdev);