KVM: fix lock imbalance

There is a missing unlock on one fail path in ioapic_mmio_write,
fix that.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index ddf6aa998b18..8a9c6cc382f8 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -292,7 +292,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
                 data = *(u32 *) val;
         else {
                 printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
-                return 0;
+                goto unlock;
         }
 
         addr &= 0xff;
@@ -313,6 +313,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
         default:
                 break;
         }
+unlock:
         mutex_unlock(&ioapic->kvm->irq_lock);
         return 0;
 }