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authorAndrey Smetanin <asmetanin@virtuozzo.com>2015-10-16 10:07:45 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-10-16 10:34:28 +0200
commit351dc6477cd35136ce4668401b1b1332a62908a8 (patch)
tree909d643640eeb91f7312572074681d915138febc /virt
parent7cae2bedcbd4680b155999655e49c27b9cf020fa (diff)
downloadlinux-linaro-stable-351dc6477cd35136ce4668401b1b1332a62908a8.tar.gz
kvm/eventfd: avoid loop inside irqfd_update()
The loop(for) inside irqfd_update() is unnecessary because any other value for irq_entry.type will just trigger schedule_work(&irqfd->inject) in irqfd_wakeup. Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com> Reviewed-by: Roman Kagan <rkagan@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Vitaly Kuznetsov <vkuznets@redhat.com> CC: "K. Y. Srinivasan" <kys@microsoft.com> CC: Gleb Natapov <gleb@kernel.org> CC: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/eventfd.c13
1 files changed, 5 insertions, 8 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index b637965746bb..518421e65b0d 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -238,20 +238,17 @@ static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd)
{
struct kvm_kernel_irq_routing_entry *e;
struct kvm_kernel_irq_routing_entry entries[KVM_NR_IRQCHIPS];
- int i, n_entries;
+ int n_entries;
n_entries = kvm_irq_map_gsi(kvm, entries, irqfd->gsi);
write_seqcount_begin(&irqfd->irq_entry_sc);
- irqfd->irq_entry.type = 0;
-
e = entries;
- for (i = 0; i < n_entries; ++i, ++e) {
- /* Only fast-path MSI. */
- if (e->type == KVM_IRQ_ROUTING_MSI)
- irqfd->irq_entry = *e;
- }
+ if (n_entries == 1)
+ irqfd->irq_entry = *e;
+ else
+ irqfd->irq_entry.type = 0;
write_seqcount_end(&irqfd->irq_entry_sc);
}