From: Jens Axboe <jens.axboe@oracle.com>
Date: Wed, 18 Jul 2007 11:18:08 +0000 (+0200)
Subject: bio: make freeing of ->bi_io_vec conditional in bio_free()
X-Git-Tag: firefly_0821_release~25449^2~2^2~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=992c5ddaf1b8b85d2252339c4c89adf7469c09ca;p=firefly-linux-kernel-4.4.55.git

bio: make freeing of ->bi_io_vec conditional in bio_free()

The empty barrier patches do not carry data, so they have no
iovec attached.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/fs/bio.c b/fs/bio.c
index ac987fc7acd9..d59ddbf79626 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -109,11 +109,14 @@ static inline struct bio_vec *bvec_alloc_bs(gfp_t gfp_mask, int nr, unsigned lon
 
 void bio_free(struct bio *bio, struct bio_set *bio_set)
 {
-	const int pool_idx = BIO_POOL_IDX(bio);
+	if (bio->bi_io_vec) {
+		const int pool_idx = BIO_POOL_IDX(bio);
 
-	BIO_BUG_ON(pool_idx >= BIOVEC_NR_POOLS);
+		BIO_BUG_ON(pool_idx >= BIOVEC_NR_POOLS);
+
+		mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
+	}
 
-	mempool_free(bio->bi_io_vec, bio_set->bvec_pools[pool_idx]);
 	mempool_free(bio, bio_set->bio_pool);
 }