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-rw-r--r--drivers/xen/events/events_base.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 6c8843968a52..499eff7d3f65 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1213,31 +1213,21 @@ void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector)
notify_remote_via_irq(irq);
}
-static DEFINE_PER_CPU(unsigned, xed_nesting_count);
-
static void __xen_evtchn_do_upcall(void)
{
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
- int cpu = get_cpu();
- unsigned count;
+ int cpu = smp_processor_id();
do {
vcpu_info->evtchn_upcall_pending = 0;
- if (__this_cpu_inc_return(xed_nesting_count) - 1)
- goto out;
-
xen_evtchn_handle_events(cpu);
BUG_ON(!irqs_disabled());
- count = __this_cpu_read(xed_nesting_count);
- __this_cpu_write(xed_nesting_count, 0);
- } while (count != 1 || vcpu_info->evtchn_upcall_pending);
-
-out:
+ virt_rmb(); /* Hypervisor can set upcall pending. */
- put_cpu();
+ } while (vcpu_info->evtchn_upcall_pending);
}
void xen_evtchn_do_upcall(struct pt_regs *regs)