[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20190729190714.519242769@linuxfoundation.org>
Date: Mon, 29 Jul 2019 21:22:46 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, David Windsor <dwindsor@...hat.com>,
David Teigland <teigland@...hat.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 079/113] dlm: check if workqueues are NULL before flushing/destroying
[ Upstream commit b355516f450703c9015316e429b66a93dfff0e6f ]
If the DLM lowcomms stack is shut down before any DLM
traffic can be generated, flush_workqueue() and
destroy_workqueue() can be called on empty send and/or recv
workqueues.
Insert guard conditionals to only call flush_workqueue()
and destroy_workqueue() on workqueues that are not NULL.
Signed-off-by: David Windsor <dwindsor@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
fs/dlm/lowcomms.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index a5e4a221435c..a93ebffe84b3 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1630,8 +1630,10 @@ static void clean_writequeues(void)
static void work_stop(void)
{
- destroy_workqueue(recv_workqueue);
- destroy_workqueue(send_workqueue);
+ if (recv_workqueue)
+ destroy_workqueue(recv_workqueue);
+ if (send_workqueue)
+ destroy_workqueue(send_workqueue);
}
static int work_start(void)
@@ -1691,13 +1693,17 @@ static void work_flush(void)
struct hlist_node *n;
struct connection *con;
- flush_workqueue(recv_workqueue);
- flush_workqueue(send_workqueue);
+ if (recv_workqueue)
+ flush_workqueue(recv_workqueue);
+ if (send_workqueue)
+ flush_workqueue(send_workqueue);
do {
ok = 1;
foreach_conn(stop_conn);
- flush_workqueue(recv_workqueue);
- flush_workqueue(send_workqueue);
+ if (recv_workqueue)
+ flush_workqueue(recv_workqueue);
+ if (send_workqueue)
+ flush_workqueue(send_workqueue);
for (i = 0; i < CONN_HASH_SIZE && ok; i++) {
hlist_for_each_entry_safe(con, n,
&connection_hash[i], list) {
--
2.20.1
Powered by blists - more mailing lists