From ce86dad222e9074d3ec174ec81cb463a770331b5 Mon Sep 17 00:00:00 2001 From: Daniel Wagner <dwagner@suse.de> Date: Mon, 3 May 2021 19:03:03 +0200 Subject: [PATCH] nvme-multipath: reset bdev to ns head when failover When a request finally completes in end_io() after it has failed over, the bdev pointer can be stale and thus the system can crash. Set the bdev back to ns head, so the request is map to an active path when resubmitted. Signed-off-by: Daniel Wagner <dwagner@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/nvme/host/multipath.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 0d0de3433f377..0551796517e61 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -70,6 +70,7 @@ void nvme_failover_req(struct request *req) struct nvme_ns *ns = req->q->queuedata; u16 status = nvme_req(req)->status & 0x7ff; unsigned long flags; + struct bio *bio; nvme_mpath_clear_current_path(ns); @@ -84,6 +85,8 @@ void nvme_failover_req(struct request *req) } spin_lock_irqsave(&ns->head->requeue_lock, flags); + for (bio = req->bio; bio; bio = bio->bi_next) + bio_set_dev(bio, ns->head->disk->part0); blk_steal_bios(&ns->head->requeue_list, req); spin_unlock_irqrestore(&ns->head->requeue_lock, flags); -- 2.30.2