From fa247089de9936a46e290d4724cb5f0b845600f5 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 22 Feb 2022 13:28:12 -0500 Subject: dm: requeue IO if mapping table not yet available Update both bio-based and request-based DM to requeue IO if the mapping table not available. This race of IO being submitted before the DM device ready is so narrow, yet possible for initial table load given that the DM device's request_queue is created prior, that it best to requeue IO to handle this unlikely case. Reported-by: Zhang Yi Signed-off-by: Mike Snitzer --- drivers/md/dm-rq.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/md/dm-rq.c') diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 6948d5db9092..3dd040a56318 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -491,8 +491,13 @@ static blk_status_t dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, if (unlikely(!ti)) { int srcu_idx; - struct dm_table *map = dm_get_live_table(md, &srcu_idx); + struct dm_table *map; + map = dm_get_live_table(md, &srcu_idx); + if (unlikely(!map)) { + dm_put_live_table(md, srcu_idx); + return BLK_STS_RESOURCE; + } ti = dm_table_find_target(map, 0); dm_put_live_table(md, srcu_idx); } -- cgit v1.2.3