s390/dasd: fix hanging blockdevice after request requeue

commit d8898ee50edecacdf0141f26fd90acf43d7e9cd7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 5a6d9c1..bce3422 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2941,7 +2941,7 @@ 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;