drbd: Keep a reference to the bio until the completion handler finished

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index aee599f..528342c 100644 (file)
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -118,6 +118,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
        bio->bi_end_io = drbd_md_io_complete;
        bio->bi_rw = rw;
 
+       bio_get(bio); /* one bio_put() is in the completion handler */
        atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */
        if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
                bio_endio(bio, -EIO);

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index ee83036..6dcd9f6 100644 (file)
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -79,6 +79,7 @@ void drbd_md_io_complete(struct bio *bio, int error)
 
        md_io->done = 1;
        wake_up(&mdev->misc_wait);
+       bio_put(bio);
        drbd_md_put_buffer(mdev);
 }