diff --git a/[refs] b/[refs]
index 4986f98299a0..702f6534a470 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 72bf809a19d9fc97bfe39bb928149b5e0f202cb6
+refs/heads/master: 4645bf306746106f805d2afa5330bf31df381626
diff --git a/trunk/drivers/xen/xen-pciback/pci_stub.c b/trunk/drivers/xen/xen-pciback/pci_stub.c
index 3cc3fbe5bf8d..8f06e1ed028c 100644
--- a/trunk/drivers/xen/xen-pciback/pci_stub.c
+++ b/trunk/drivers/xen/xen-pciback/pci_stub.c
@@ -220,6 +220,8 @@ void pcistub_put_pci_dev(struct pci_dev *dev)
 	}
 
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
+	if (WARN_ON(!found_psdev))
+		return;
 
 	/*hold this lock for avoiding breaking link between
 	* pcistub and xen_pcibk when AER is in processing