nfsd4: nfsd_shutdown_net needs state lock

A comment claims the caller should take it, but that's not being done.
Note we don't want it around the cancel_delayed_work_sync since that may
wait on work which holds the client lock.

Reported-by: Benny Halevy <bhalevy@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 21eb6788cb33..e03e8efff53f 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5124,7 +5124,6 @@ out_recovery:
         return ret;
 }
 
-/* should be called with the state lock held */
 void
 nfs4_state_shutdown_net(struct net *net)
 {
@@ -5135,6 +5134,7 @@ nfs4_state_shutdown_net(struct net *net)
         cancel_delayed_work_sync(&nn->laundromat_work);
         locks_end_grace(&nn->nfsd4_manager);
 
+        nfs4_lock_state();
         INIT_LIST_HEAD(&reaplist);
         spin_lock(&recall_lock);
         list_for_each_safe(pos, next, &nn->del_recall_lru) {
@@ -5149,6 +5149,7 @@ nfs4_state_shutdown_net(struct net *net)
 
         nfsd4_client_tracking_exit(net);
         nfs4_state_destroy_net(net);
+        nfs4_unlock_state();
 }
 
 void