diff options
| -rw-r--r-- | kernel/workqueue.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 9ae0693ca520..c0b6eb1e0b83 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1901,6 +1901,12 @@ static void send_mayday(struct work_struct *work) /* mayday mayday mayday */ if (list_empty(&pwq->mayday_node)) { + /* + * If @pwq is for an unbound wq, its base ref may be put at + * any time due to an attribute change. Pin @pwq until the + * rescuer is done with it. + */ + get_pwq(pwq); list_add_tail(&pwq->mayday_node, &wq->maydays); wake_up_process(wq->rescuer->task); } @@ -2430,6 +2436,12 @@ repeat: process_scheduled_works(rescuer); /* + * Put the reference grabbed by send_mayday(). @pool won't + * go away while we're holding its lock. + */ + put_pwq(pwq); + + /* * Leave this pool. If keep_working() is %true, notify a * regular worker; otherwise, we end up with 0 concurrency * and stalling the execution. |