NFS: Fix an Oops in the nfs_access_cache_shrinker()

The nfs_access_cache_shrinker may race with nfs_access_zap_cache().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 0f41678fd7ee..322141f4ab48 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1743,8 +1743,8 @@ int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask)
         struct nfs_inode *nfsi;
         struct nfs_access_entry *cache;
 
-        spin_lock(&nfs_access_lru_lock);
 restart:
+        spin_lock(&nfs_access_lru_lock);
         list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) {
                 struct inode *inode;
 
@@ -1769,6 +1769,7 @@ remove_lru_entry:
                         clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags);
                 }
                 spin_unlock(&inode->i_lock);
+                spin_unlock(&nfs_access_lru_lock);
                 iput(inode);
                 goto restart;
         }