nfs: fix error handling in lock_and_join_requests

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@primarydata.com>
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Reviewed-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 27715306f24b..e056f617adf2 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -480,8 +480,11 @@ 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 {
                 /*