linux-kernel - [PATCH 1/2] bio: Remove the incorrect test for idx in __bio_clone

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Date:	Fri, 18 Dec 2015 23:02:31 +0800
From:	Minfei Huang <mnfhuang@...il.com>
To:	axboe@...nel.dk
Cc:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	mhuang@...hat.com, Minfei Huang <mnfhuang@...il.com>
Subject: [PATCH 1/2] bio: Remove the incorrect test for idx in __bio_clone_fast

It is more lucky that kernel crash does not happen, since we test the
bi_pool in function __bio_clone_fast. Now bi_flags is used to flag the
idx, so it is incorrect to test the bi_pool.

For now, the bio in function __bio_clone_fast may have its own bvec, if
the caller is bio_clone_fast.

Removing the test to fix this issue.

Signed-off-by: Minfei Huang <mnfhuang@...il.com>
---
 block/bio.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 4f184d9..70d9814 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -573,8 +573,6 @@ EXPORT_SYMBOL(bio_phys_segments);
  */
 void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
 {
-	BUG_ON(bio->bi_pool && BIO_POOL_IDX(bio) != BIO_POOL_NONE);
-
 	/*
 	 * most users will be overriding ->bi_bdev with a new target,
 	 * so we don't set nor calculate new physical/hw segment counts here
-- 
2.6.3

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