diff options
| author | David Windsor <dwindsor@redhat.com> | 2019-04-02 08:37:10 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-31 07:27:07 +0200 |
| commit | e7a41b276974d35bac948f08327d8f4297d739ba (patch) | |
| tree | 6c335179a80e0ccb0db38f5ed87e7535de804747 | |
| parent | 5d59e28c3d1b94d318e3e74d4e9adb327bb116c0 (diff) | |
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@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/dlm/lowcomms.c | 18 |
1 files 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) { |