[PATCH 3.16 170/357] nfs: fix error handling in lock_and_join_requests

[Greg Kroah-Hartman]

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>

commit 94970014c46223cbcdfbfc67b89596a412f9e3dd upstream.

This fixes handling of errors from nfs_page_group_lock in
nfs_lock_and_join_requests.  It now releases the inode lock and the
reference to the head request.

Reported-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Weston Andros Adamson <dros@xxxxxxxxxxxxxxx>
Reviewed-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nfs/write.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -455,8 +455,11 @@ try_again:
 
 	/* lock each request in the page group */
 	ret = nfs_page_group_lock(head, true);
-	if (ret < 0)
+	if (ret < 0) {
+		spin_unlock(&inode->i_lock);
+		nfs_release_request(head);
 		return ERR_PTR(ret);
+	}
 	subreq = head;
 	do {
 		/*


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