From: Josh Law <hlcj1234567@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Josh Law <objecting@objecting.org>
Subject: [PATCH v1 1/2] lib/lwq: fix potential kthread_stop() hang in test
Date: Thu, 12 Mar 2026 22:14:26 +0000 [thread overview]
Message-ID: <20260312221427.75011-2-objecting@objecting.org> (raw)
In-Reply-To: <20260312221427.75011-1-objecting@objecting.org>
From: Josh Law <objecting@objecting.org>
Check kthread_should_stop() in lwq_exercise()'s wait_var_event()
so the thread can exit cleanly when kthread_stop() is called while
the queue is empty.
Signed-off-by: Josh Law <objecting@objecting.org>
---
lib/lwq.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/lib/lwq.c b/lib/lwq.c
index c1e11ba6f254..1fd2ed612c75 100644
--- a/lib/lwq.c
+++ b/lib/lwq.c
@@ -86,7 +86,10 @@ static int lwq_exercise(void *qv)
struct tnode *t;
for (cnt = 0; cnt < 10000; cnt++) {
- wait_var_event(q, (t = lwq_dequeue(q, struct tnode, n)) != NULL);
+ wait_var_event(q, (t = lwq_dequeue(q, struct tnode, n)) != NULL ||
+ kthread_should_stop());
+ if (!t)
+ break;
t->c++;
if (lwq_enqueue(&t->n, q))
wake_up_var(q);
--
2.34.1
next prev parent reply other threads:[~2026-03-12 22:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-12 22:14 [PATCH v1 0/2] lib/lwq: fixes for test module hang and unload Josh Law
2026-03-12 22:14 ` Josh Law [this message]
2026-03-12 22:14 ` [PATCH v1 2/2] lib/lwq: add missing module_exit for test module Josh Law
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