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for-linus-20190127

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Merge tag 'for-linus-20190127' of git://git.kernel.dk/linux-block

Pull block revert from Jens Axboe:
 "Silly error snuck into a patch from the last series, let's do a revert
  to avoid a potential use-after-free"

* tag 'for-linus-20190127' of git://git.kernel.dk/linux-block:
  Revert "block: cover another queue enter recursion via BIO_QUEUE_ENTERED"
This commit is contained in:
Linus Torvalds 2019-01-27 10:58:20 -08:00
commit 419967d53f
2 changed files with 10 additions and 11 deletions
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11
block/blk-core.c
View File

@ -1083,18 +1083,7 @@ blk_qc_t generic_make_request(struct bio *bio)
/* Create a fresh bio_list for all subordinate requests */
bio_list_on_stack[1] = bio_list_on_stack[0];
bio_list_init(&bio_list_on_stack[0]);
/*
* 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);
ret = q->make_request_fn(q, bio);
bio_clear_flag(bio, BIO_QUEUE_ENTERED);
/* sort new bios into those for a lower level
* and those for the same level

10
block/blk-merge.c
View File

@ -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);