From e147d83835a64798cc7e1ee09e992ebb90b9d3ea Mon Sep 17 00:00:00 2001
From: Asias He <asias.hejun@gmail.com>
Date: Wed, 13 Apr 2011 00:23:29 +0800
Subject: [PATCH] kvm tools: Fix lock imbalance in virtio_console_pci_io_out()

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---
 virtio-console.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/virtio-console.c b/virtio-console.c
index 9675090..aa9b1bd 100644
--- a/virtio-console.c
+++ b/virtio-console.c
@@ -163,6 +163,8 @@ static bool virtio_console_pci_io_out(struct kvm *self, uint16_t port, void *dat
 	unsigned long offset = port - IOPORT_VIRTIO_CONSOLE;
 	bool ret = true;
 
+	mutex_lock(&console_device.mutex);
+
 	switch (offset) {
 	case VIRTIO_PCI_GUEST_FEATURES:
 		console_device.guest_features	= ioport__read32(data);