From: don.hong <don.hong@samsung.com>
Date: Fri, 16 Mar 2012 14:46:41 +0000 (+0900)
Subject: [Title] Fixed a kernel panic when to mount 9pfs without qemu virtfs device
X-Git-Tag: 2.2.1_release^2~156
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=054d3ac751902ce098b6da18bb97bb115375f75e;p=sdk%2Femulator%2Femulator-kernel.git

[Title] Fixed a kernel panic when to mount 9pfs without qemu virtfs device
[Type] BugFix
[Module]
[Priority]
[Jira#]
[Redmine#]
[Problem] This is kernel bug
[Cause]
[Solution]
[TestCase]

Change-Id: I391633a073ee991c1dd0a85d936c63981b2e34da
---

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index ea1e3daabefe..c7a02dfd9e41 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -101,6 +101,9 @@ static void p9_virtio_close(struct p9_client *client)
 {
 	struct virtio_chan *chan = client->trans;
 
+	if (!chan)
+		return ;
+
 	mutex_lock(&virtio_9p_lock);
 	chan->inuse = false;
 	mutex_unlock(&virtio_9p_lock);