s390/dasd: fix hanging blockdevice after request requeue

The DASD driver does not kick the requeue list when requeuing IO requests
to the blocklayer. This might lead to hanging blockdevice when there is
no other trigger for this.

Fix by automatically kick the requeue list when requeuing DASD requests
to the blocklayer.

Fixes: e443343e509a ("s390/dasd: blk-mq conversion")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Link: https://lore.kernel.org/r/20230405142017.2446986-8-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 3696931..9fbfce7 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2953,7 +2953,7 @@ static int _dasd_requeue_request(struct dasd_ccw_req *cqr)
                return 0;
        spin_lock_irq(&cqr->dq->lock);
        req = (struct request *) cqr->callback_data;
-       blk_mq_requeue_request(req, false);
+       blk_mq_requeue_request(req, true);
        spin_unlock_irq(&cqr->dq->lock);
 
        return 0;