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authorLars Ellenberg <lars.ellenberg@linbit.com>2013-12-27 17:17:25 +0100
committerPhilipp Reisner <philipp.reisner@linbit.com>2014-07-10 18:34:50 +0200
commita80ca1ae81fc52e304e753f6de4ef248df364f9e (patch)
tree3e45ac841a66fe27df95d6253cc88be781dd3bd8 /drivers/block/drbd/drbd_worker.c
parentc7a58db4e9dc523b18bbfbc3aa311d8308acc293 (diff)
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drbd: fix a race stopping the worker thread
We may implicitly call drbd_send() from inside wait_for_work(), via maybe_send_barrier(). If the "stop" signal was send just before that, drbd_send() would call flush_signals(), and we would run an unbounded schedule() afterwards. Fix: check for thread_state == RUNNING before we schedule() Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_worker.c')
-rw-r--r--drivers/block/drbd/drbd_worker.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 59158858b17a..47bc84017b5b 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1930,6 +1930,9 @@ static void wait_for_work(struct drbd_connection *connection, struct list_head *
if (send_barrier)
maybe_send_barrier(connection,
connection->send.current_epoch_nr + 1);
+ /* drbd_send() may have called flush_signals() */
+ if (get_t_state(&connection->worker) != RUNNING)
+ break;
schedule();
/* may be woken up for other things but new work, too,
* e.g. if the current epoch got closed.