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authorChristoph Hellwig <hch@lst.de>2018-12-17 12:16:26 +0100
committerJens Axboe <axboe@kernel.dk>2018-12-17 05:44:45 -0700
commit5aceaeb26394538858a9dbae5830d628469a44cf (patch)
treee99f8902a6bcaa8eebaae309059b239f966eaac6 /block/blk-mq.h
parent346fc1089e5d4734990b4b6c3cd0cdeae9ae482d (diff)
blk-mq: only dispatch to non-defauly queue maps if they have queues
We should check if a given queue map actually has queues enabled before dispatching to it. This allows drivers to not initialize optional but not used map types, which subsequently will allow fixing problems with queue map rebuilds for that case. Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r--block/blk-mq.h13
1 files changed, 8 insertions, 5 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h
index b63a0de8a07a..d1ed096723fb 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -105,14 +105,17 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
{
enum hctx_type type = HCTX_TYPE_DEFAULT;
- if (q->tag_set->nr_maps > HCTX_TYPE_POLL &&
- ((flags & REQ_HIPRI) && test_bit(QUEUE_FLAG_POLL, &q->queue_flags)))
+ if ((flags & REQ_HIPRI) &&
+ q->tag_set->nr_maps > HCTX_TYPE_POLL &&
+ q->tag_set->map[HCTX_TYPE_POLL].nr_queues &&
+ test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
type = HCTX_TYPE_POLL;
- else if (q->tag_set->nr_maps > HCTX_TYPE_READ &&
- ((flags & REQ_OP_MASK) == REQ_OP_READ))
+ else if (((flags & REQ_OP_MASK) == REQ_OP_READ) &&
+ q->tag_set->nr_maps > HCTX_TYPE_READ &&
+ q->tag_set->map[HCTX_TYPE_READ].nr_queues)
type = HCTX_TYPE_READ;
-
+
return blk_mq_map_queue_type(q, type, cpu);
}