NFS: Release dcache_lock in an error path of nfs_path

In one of the error paths of nfs_path, it may return with dcache_lock still
held; fix this by adding and using a new error path Elong_unlock which unlocks
dcache_lock.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
(cherry picked from f4b90b43677fb23297c56802c3056fc304f988d9 commit)

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 19b98ca468eb..86b3169c8cac 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -51,7 +51,7 @@ char *nfs_path(const char *base, const struct dentry *dentry,
                 namelen = dentry->d_name.len;
                 buflen -= namelen + 1;
                 if (buflen < 0)
-                        goto Elong;
+                        goto Elong_unlock;
                 end -= namelen;
                 memcpy(end, dentry->d_name.name, namelen);
                 *--end = '/';
@@ -68,6 +68,8 @@ char *nfs_path(const char *base, const struct dentry *dentry,
         end -= namelen;
         memcpy(end, base, namelen);
         return end;
+Elong_unlock:
+        spin_unlock(&dcache_lock);
 Elong:
         return ERR_PTR(-ENAMETOOLONG);
 }