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authorLars Ellenberg <lars.ellenberg@linbit.com>2012-08-22 11:47:14 +0200
committerPhilipp Reisner <philipp.reisner@linbit.com>2012-11-09 14:08:21 +0100
commitbc317a9ecd641b78a4b237cb22b30ecf11443c77 (patch)
treea7c97ada41d22ff2f7fb7aae8bd025818e79a458 /drivers
parentc02abda2b28734a7e97e15db866507b3cb92b7d0 (diff)
downloadvexpress-lsk-bc317a9ecd641b78a4b237cb22b30ecf11443c77.tar.gz
drbd: dequeue single work items in wait_for_work()
As long as we still use drbd_queue_work_front(), we must only dequeue the single first item during normal operation. The comment in drbd_worker() even says so, but bc8a5a1 drbd: remove struct drbd_tl_epoch objects (barrier works) introduced the batch dequeueing again via list_splice_init() in wait_for_work(). Change back to list_move() of the first item, if any. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/drbd/drbd_worker.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index c674f17773a..859afdfe5a0 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1792,7 +1792,10 @@ void wait_for_work(struct drbd_tconn *connection, struct list_head *work_list)
prepare_to_wait(&connection->sender_work.q_wait, &wait, TASK_INTERRUPTIBLE);
spin_lock_irq(&connection->req_lock);
spin_lock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */
- list_splice_init(&connection->sender_work.q, work_list);
+ /* dequeue single item only,
+ * we still use drbd_queue_work_front() in some places */
+ if (!list_empty(&connection->sender_work.q))
+ list_move(connection->sender_work.q.next, work_list);
spin_unlock(&connection->sender_work.q_lock); /* FIXME get rid of this one? */
if (!list_empty(work_list) || signal_pending(current)) {
spin_unlock_irq(&connection->req_lock);