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bio: safeguard REQ_ALLOC_CACHE bio put 

bio_put() with REQ_ALLOC_CACHE assumes that it's executed not from
an irq context. Let's add a warning if the invariant is not respected,
especially since there is a couple of places removing REQ_POLLED by hand
without also clearing REQ_ALLOC_CACHE.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/558d78313476c4e9c233902efa0092644c3d420a.1666122465.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-10-18 20:50:55 +01:00 committed by Jens Axboe
parent 33566f92cd
commit d4347d5040
1 changed files with 1 additions and 1 deletions
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2
block/bio.c
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@ -741,7 +741,7 @@ void bio_put(struct bio *bio)
return;
}
if (bio->bi_opf & REQ_ALLOC_CACHE) {
if ((bio->bi_opf & REQ_ALLOC_CACHE) && !WARN_ON_ONCE(in_interrupt())) {
struct bio_alloc_cache *cache;
bio_uninit(bio);