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blk-mq: skip zero-queue maps in blk_mq_map_swqueue

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From 7e849dd9cf ("nvme-pci: don't share queue maps"), the mapping
table won't be initialized actually if map->nr_queues is zero, so
we can't use blk_mq_map_queue_type() to retrieve hctx any more.

This way still may cause broken mapping, fix it by skipping zero-queues
maps in blk_mq_map_swqueue().

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2018-12-18 01:28:56 +08:00 committed by Jens Axboe
parent 13369816cb
commit e5edd5f298
1 changed files with 3 additions and 0 deletions
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3
block/blk-mq.c
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@ -2438,6 +2438,9 @@ static void blk_mq_map_swqueue(struct request_queue *q)
ctx = per_cpu_ptr(q->queue_ctx, i);
for (j = 0; j < set->nr_maps; j++) {
if (!set->map[j].nr_queues)
continue;
hctx = blk_mq_map_queue_type(q, j, i);
/*