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Revert "block: cover another queue enter recursion via BIO_QUEUE_ENTERED"

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We can't touch a bio after ->make_request_fn(), for all we know it could
already have been completed by the time this function returns.

This reverts commit 698cef1739.

Reported-by: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2019-01-27 06:35:28 -07:00
commit 947b7ac135
2 changed files with 10 additions and 11 deletions
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10
block/blk-merge.c
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@ -272,6 +272,16 @@ void blk_queue_split(struct request_queue *q, struct bio **bio)
/* there isn't chance to merge the splitted bio */
split->bi_opf |= REQ_NOMERGE;
/*
* Since we're recursing into make_request here, ensure
* that we mark this bio as already having entered the queue.
* If not, and the queue is going away, we can get stuck
* forever on waiting for the queue reference to drop. But
* that will never happen, as we're already holding a
* reference to it.
*/
bio_set_flag(*bio, BIO_QUEUE_ENTERED);
bio_chain(split, *bio);
trace_block_split(q, split, (*bio)->bi_iter.bi_sector);
generic_make_request(*bio);