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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-06-20 11:15:49 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-06-20 19:27:14 -0600 |
| commit | 5435c023b92ee1cfb896d924d28c6d31d8386aa0 (patch) | |
| tree | a88194a4ecc892f05f9b4b9f3a31877f7b0b805a /block | |
| parent | edf8ff558887364714e115d396b2d06949cf1e07 (diff) | |
| download | lwn-5435c023b92ee1cfb896d924d28c6d31d8386aa0.tar.gz lwn-5435c023b92ee1cfb896d924d28c6d31d8386aa0.zip | |
blk-mq: Warn when attempting to run a hardware queue that is not mapped
A queue must be frozen while the mapped state of a hardware queue
is changed. Additionally, any change of the mapped state is
followed by a call to blk_mq_map_swqueue() (see also
blk_mq_init_allocated_queue() and blk_mq_update_nr_hw_queues()).
Since blk_mq_map_swqueue() does not map any unmapped hardware
queue onto any software queue, no attempt will be made to run
an unmapped hardware queue. Hence issue a warning upon attempts
to run an unmapped hardware queue.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 1d8050e49a94..1c4f1f4978c6 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1129,8 +1129,10 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async, unsigned long msecs) { - if (unlikely(blk_mq_hctx_stopped(hctx) || - !blk_mq_hw_queue_mapped(hctx))) + if (WARN_ON_ONCE(!blk_mq_hw_queue_mapped(hctx))) + return; + + if (unlikely(blk_mq_hctx_stopped(hctx))) return; if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { @@ -1295,7 +1297,7 @@ static void blk_mq_run_work_fn(struct work_struct *work) void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) { - if (unlikely(!blk_mq_hw_queue_mapped(hctx))) + if (WARN_ON_ONCE(!blk_mq_hw_queue_mapped(hctx))) return; /* |