From: Philipp Reisner Date: Tue, 16 Nov 2010 09:07:53 +0000 (+0100) Subject: drbd: use test_and_set_bit() to decide if bm_io_work should be queued X-Git-Tag: firefly_0821_release~7613^2~1765^2~95 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=127b317844e7cc0458743b604998bece95eab030;p=firefly-linux-kernel-4.4.55.git drbd: use test_and_set_bit() to decide if bm_io_work should be queued Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index f49505cf8d0f..843b90966920 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -3772,6 +3772,7 @@ static int w_bitmap_io(struct drbd_conf *mdev, struct drbd_work *w, int unused) drbd_bm_unlock(mdev); clear_bit(BITMAP_IO, &mdev->flags); + smp_mb__after_clear_bit(); wake_up(&mdev->misc_wait); if (work->done) @@ -3850,11 +3851,8 @@ void drbd_queue_bitmap_io(struct drbd_conf *mdev, set_bit(BITMAP_IO, &mdev->flags); if (atomic_read(&mdev->ap_bio_cnt) == 0) { - if (list_empty(&mdev->bm_io_work.w.list)) { - set_bit(BITMAP_IO_QUEUED, &mdev->flags); + if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); - } else - dev_err(DEV, "FIXME avoided double queuing bm_io_work\n"); } }