Merge branch 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (821 commits)
  x86: make 64bit hpet_set_mapping to use ioremap too, v2
  x86: get x86_phys_bits early
  x86: max_low_pfn_mapped fix #4
  x86: change _node_to_cpumask_ptr to return const ptr
  x86: I/O APIC: remove an IRQ2-mask hack
  x86: fix numaq_tsc_disable calling
  x86, e820: remove end_user_pfn
  x86: max_low_pfn_mapped fix, #3
  x86: max_low_pfn_mapped fix, #2
  x86: max_low_pfn_mapped fix, #1
  x86_64: fix delayed signals
  x86: remove conflicting nx6325 and nx6125 quirks
  x86: Recover timer_ack lost in the merge of the NMI watchdog
  x86: I/O APIC: Never configure IRQ2
  x86: L-APIC: Always fully configure IRQ0
  x86: L-APIC: Set IRQ0 as edge-triggered
  x86: merge dwarf2 headers
  x86: use AS_CFI instead of UNWIND_INFO
  x86: use ignore macro instead of hash comment
  x86: use matching CFI_ENDPROC
  ...

1 files changed, 12 insertions, 11 deletions

diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c
index 6efbe3f29ca5..090c61ee8fd0 100644
--- a/drivers/xen/xenbus/xenbus_comms.c
+++ b/drivers/xen/xenbus/xenbus_comms.c
@@ -203,7 +203,6 @@ int xb_read(void *data, unsigned len)
 int xb_init_comms(void)
 {
         struct xenstore_domain_interface *intf = xen_store_interface;
-        int err;
 
         if (intf->req_prod != intf->req_cons)
                 printk(KERN_ERR "XENBUS request ring is not quiescent "
@@ -216,18 +215,20 @@ int xb_init_comms(void)
                 intf->rsp_cons = intf->rsp_prod;
         }
 
-        if (xenbus_irq)
-                unbind_from_irqhandler(xenbus_irq, &xb_waitq);
+        if (xenbus_irq) {
+                /* Already have an irq; assume we're resuming */
+                rebind_evtchn_irq(xen_store_evtchn, xenbus_irq);
+        } else {
+                int err;
+                err = bind_evtchn_to_irqhandler(xen_store_evtchn, wake_waiting,
+                                                0, "xenbus", &xb_waitq);
+                if (err <= 0) {
+                        printk(KERN_ERR "XENBUS request irq failed %i\n", err);
+                        return err;
+                }
 
-        err = bind_evtchn_to_irqhandler(
-                xen_store_evtchn, wake_waiting,
-                0, "xenbus", &xb_waitq);
-        if (err <= 0) {
-                printk(KERN_ERR "XENBUS request irq failed %i\n", err);
-                return err;
+                xenbus_irq = err;
         }
 
-        xenbus_irq = err;
-
         return 0;
 }