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 <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Link: https://lore.kernel.org/r/558d78313476c4e9c233902efa0092644c3d420a.1666122465.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <[email protected]>
josf · Oct 20, 2022 · d4347d5 · d4347d5
1 parent 33566f9
commit d4347d5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/block/bio.c b/block/bio.c
@@ -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);