[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 ea1e3daabefeddb1dc6f46ddf5538b33cc3c0317..c7a02dfd9e41e126bae5ad8b12b83f2c70545319 100644 (file)
--- 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);