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block: fix too broad elevator check in blk_mq_free_request()

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We added RQF_ELV to tell whether there's an IO scheduler attached, and
RQF_ELVPRIV tells us whether there's an IO scheduler with private data
attached. Don't check RQF_ELV in blk_mq_free_request(), what we care
about here is just if we have scheduler private data attached.

This fixes a boot crash

Fixes: 2ff0682da6 ("block: store elevator state in request")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Reported-by: syzbot+eb8104072aeab6cc1195@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-10-18 20:54:39 -06:00
parent 4f5022453a
commit e0d78afeb8
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq.c
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@ -580,7 +580,7 @@ void blk_mq_free_request(struct request *rq)
struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
if (rq->rq_flags & (RQF_ELVPRIV | RQF_ELV)) {
if (rq->rq_flags & RQF_ELVPRIV) {
struct elevator_queue *e = q->elevator;
if (e->type->ops.finish_request)