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nfs: allow the v4.1 callback thread to freeze

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The v4.1 callback thread has set_freezable() at the top, but it doesn't
ever try to freeze within the loop. Have it call try_to_freeze() at the
top of the loop. If a freeze event occurs, recheck kthread_should_stop()
after thawing.

Reported-by: Yanchuan Nian <ycnian@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jeff Layton 2013-03-25 07:59:57 -04:00 committed by Trond Myklebust
parent 809b426c7f
commit 25d280aad8
1 changed files with 3 additions and 0 deletions
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3
fs/nfs/callback.c
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@ -125,6 +125,9 @@ nfs41_callback_svc(void *vrqstp)
set_freezable(); set_freezable();
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
if (try_to_freeze())
continue;
prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE); prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
spin_lock_bh(&serv->sv_cb_lock); spin_lock_bh(&serv->sv_cb_lock);
if (!list_empty(&serv->sv_cb_list)) { if (!list_empty(&serv->sv_cb_list)) {