From: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Date: Thu, 29 Nov 2012 03:17:25 +0000 (+1100)
Subject: virtio: balloon: fix missing unlock on error in fill_balloon()
X-Git-Tag: next-20121205~1^2~302
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=438e825cef3ae3bcca7a2eaa66491cd6f1829851;p=karo-tx-linux.git

virtio: balloon: fix missing unlock on error in fill_balloon()

Add the missing unlock before return from function fill_balloon()
in the error handling case.

Introduced by 9864a8 ("virtio_balloon: introduce migration primitives to
balloon pages").

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 8f92ab788b0e..eae1e03c30dd 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -152,8 +152,10 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
 	}
 
 	/* Didn't get any?  Oh well. */
-	if (vb->num_pfns == 0)
+	if (vb->num_pfns == 0) {
+		mutex_unlock(&vb->balloon_lock);
 		return;
+	}
 
 	tell_host(vb, vb->inflate_vq);
 	mutex_unlock(&vb->balloon_lock);