Commit e5edd5f2 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe

blk-mq: skip zero-queue maps in blk_mq_map_swqueue

From 7e849dd9 ("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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 13369816
......@@ -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);
/*
......
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