workqueue: make workqueue_exit() safe for multiple exit calls

This might happen if we fail init.

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/workqueue.c b/workqueue.c
index 06fc26310dd57a829c4b05ce5bc00cd17856ab3f..5fd95b905aa8dff77090fcebdd7d1459a8b38067 100644 (file)
--- a/workqueue.c
+++ b/workqueue.c
@@ -234,6 +234,9 @@ void workqueue_exit(struct workqueue *wq)
        struct submit_worker *sw;
        int i;
 
+       if (!wq->workers)
+               return;
+
        for (i = 0; i < wq->max_workers; i++) {
                sw = &wq->workers[i];
 
@@ -258,6 +261,7 @@ void workqueue_exit(struct workqueue *wq)
        } while (shutdown && shutdown != wq->max_workers);
 
        free(wq->workers);
+       wq->workers = NULL;
        pthread_mutex_destroy(&wq->flush_lock);
        pthread_cond_destroy(&wq->flush_cond);
        pthread_mutex_destroy(&wq->stat_lock);