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blk-mq-sched: alloate reserved tags out of normal pool 

At least one driver, mtip32xx, has a hard coded dependency on
the value of the reserved tag used for internal commands. While
that should really be fixed up, for now let's ensure that we just
bypass the scheduler tags an allocation marked as reserved. They
are used for house keeping or error handling, so we can safely
ignore them in the scheduler.

Tested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
hifive-unleashed-5.1
Jens Axboe 2017-04-27 07:45:46 -06:00
parent a4e84aae81
commit 339318080b
1 changed files with 5 additions and 1 deletions
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6
block/blk-mq-sched.c
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@ -82,7 +82,11 @@ struct request *blk_mq_sched_get_request(struct request_queue *q,
if (likely(!data->hctx))
data->hctx = blk_mq_map_queue(q, data->ctx->cpu);
if (e) {
/*
* For a reserved tag, allocate a normal request since we might
* have driver dependencies on the value of the internal tag.
*/
if (e && !(data->flags & BLK_MQ_REQ_RESERVED)) {
data->flags |= BLK_MQ_REQ_INTERNAL;
/*