linux-kernel - [PATCH] nfs: allow the v4.1 callback thread to freeze

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Date:	Tue, 26 Mar 2013 09:06:39 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	trond.myklebust@...app.com
Cc:	ycnian@...il.com, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] nfs: allow the v4.1 callback thread to freeze

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-and-Tested-by: Yanchuan Nian <ycnian@...il.com>
Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/nfs/callback.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 5088b57..cff089a 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -125,6 +125,9 @@ nfs41_callback_svc(void *vrqstp)
 	set_freezable();
 
 	while (!kthread_should_stop()) {
+		if (try_to_freeze())
+			continue;
+
 		prepare_to_wait(&serv->sv_cb_waitq, &wq, TASK_INTERRUPTIBLE);
 		spin_lock_bh(&serv->sv_cb_lock);
 		if (!list_empty(&serv->sv_cb_list)) {
-- 
1.7.11.7

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