diff options
| author |   David Windsor <dwindsor@redhat.com> | 2019-04-02 08:37:10 -0400 |
|---|---|---|
| committer |   David Teigland <teigland@redhat.com> | 2019-07-11 11:01:58 -0500 |
| commit | b355516f450703c9015316e429b66a93dfff0e6f (patch) | |
| tree | 02f2ccd174fb792329cbfc03955f8b9fff4fcd78 /fs/dlm | |
| parent | Linux 5.2-rc4 (diff) | |
| download | wireguard-linux-b355516f450703c9015316e429b66a93dfff0e6f.tar.xz wireguard-linux-b355516f450703c9015316e429b66a93dfff0e6f.zip | |
dlm: check if workqueues are NULL before flushing/destroying
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>
Diffstat (limited to 'fs/dlm')
| -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 114ebfe30929..3951d39b9b75 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -1628,8 +1628,10 @@ 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) @@ -1689,13 +1691,17 @@ 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) { |