From 11eb695feb636fa5211067189cad25ac073e7fe5 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 24 Feb 2023 09:59:44 -0700
Subject: [PATCH] block: clear bio->bi_bdev when putting a bio back in the
cache
This isn't strictly needed in terms of correctness, but it does allow
polling to know if the bio has been put already by a different task
and hence avoid polling something that we don't need to.
Cc: stable@vger.kernel.org
Fixes: be4d234d7aeb ("bio: add allocation cache abstraction")
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/bio.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/bio.c b/block/bio.c
index 2693f34afb7e9..605c400250688 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -772,6 +772,7 @@ static inline void bio_put_percpu_cache(struct bio *bio)
if ((bio->bi_opf & REQ_POLLED) && !WARN_ON_ONCE(in_interrupt())) {
bio->bi_next = cache->free_list;
+ bio->bi_bdev = NULL;
cache->free_list = bio;
cache->nr++;
} else {
--
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