When a waiter is waked by CB_NOTIFY_LOCK, it will retry
nfs4_proc_setlk(). The waiter may fail to nfs4_proc_setlk() and sleep
again. However, the waiter is already removed from clp->cl_lock_waitq
when handling CB_NOTIFY_LOCK in nfs4_wake_lock_waiter(). So any
subsequent CB_NOTIFY_LOCK won't wake this waiter anymore. We should
put the waiter back to clp->cl_lock_waitq before retrying.
Cc: stable@xxxxxxxxxxxxxxx #4.9+
Signed-off-by: Yihao Wu <wuyihao@xxxxxxxxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f9ed6b5..218c086 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6988,20 +6988,22 @@ struct nfs4_lock_waiter {
init_wait(&wait);
wait.private = &waiter;
wait.func = nfs4_wake_lock_waiter;
- add_wait_queue(q, &wait);
while(!signalled()) {
+ add_wait_queue(q, &wait);
status = nfs4_proc_setlk(state, cmd, request);
- if ((status != -EAGAIN) || IS_SETLK(cmd))
+ if ((status != -EAGAIN) || IS_SETLK(cmd)) {
+ finish_wait(q, &wait);
break;
+ }
status = -ERESTARTSYS;
freezer_do_not_count();
wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
freezer_count();
+ finish_wait(q, &wait);
}
- finish_wait(q, &wait);
return status;
}
#else /* !CONFIG_NFS_V4_1 */
--
1.8.3.1
