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blk-mq: don't handle failure in .get_budget

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It is enough to just check if we can get the budget via .get_budget().
And we don't need to deal with device state change in .get_budget().

For SCSI, one issue to be fixed is that we have to call
scsi_mq_uninit_cmd() to free allocated ressources if SCSI device fails
to handle the request. And it isn't enough to simply call
blk_mq_end_request() to do that if this request is marked as
RQF_DONTPREP.

Fixes: 0df21c86bdbf(scsi: implement .get_budget and .put_budget for blk-mq)
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei
2017-11-05 02:21:12 +08:00
committed by Jens Axboe
parent 826a70a08b
commit 88022d7201
5 changed files with 12 additions and 37 deletions
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14
block/blk-mq-sched.c
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@@ -94,23 +94,18 @@ static void blk_mq_do_dispatch_sched(struct blk_mq_hw_ctx *hctx)
do {
struct request *rq;
blk_status_t ret;
if (e->type->ops.mq.has_work &&
!e->type->ops.mq.has_work(hctx))
break;
ret = blk_mq_get_dispatch_budget(hctx);
if (ret == BLK_STS_RESOURCE)
if (!blk_mq_get_dispatch_budget(hctx))
break;
rq = e->type->ops.mq.dispatch_request(hctx);
if (!rq) {
blk_mq_put_dispatch_budget(hctx);
break;
} else if (ret != BLK_STS_OK) {
blk_mq_end_request(rq, ret);
continue;
}
/*
@@ -146,22 +141,17 @@ static void blk_mq_do_dispatch_ctx(struct blk_mq_hw_ctx *hctx)
do {
struct request *rq;
blk_status_t ret;
if (!sbitmap_any_bit_set(&hctx->ctx_map))
break;
ret = blk_mq_get_dispatch_budget(hctx);
if (ret == BLK_STS_RESOURCE)
if (!blk_mq_get_dispatch_budget(hctx))
break;
rq = blk_mq_dequeue_from_ctx(hctx, ctx);
if (!rq) {
blk_mq_put_dispatch_budget(hctx);
break;
} else if (ret != BLK_STS_OK) {
blk_mq_end_request(rq, ret);
continue;
}
/*