[BLOCK] bio: init ->bi_bdev in bio_init()

For SG_IO requests, bio->bi_bdev may not be explicitly initialized. So make
bio_init() clear the field to make sure it's always NULL or valid.

Signed-off-by: Jens Axboe <axboe@suse.de>

diff --git a/fs/bio.c b/fs/bio.c
index dfe242a21eb4cb49d00d4ee54def5c024be1ea0b..7b30695899511ca64404f8061a9d1563573db44c 100644 (file)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -126,6 +126,7 @@ static void bio_fs_destructor(struct bio *bio)
 inline void bio_init(struct bio *bio)
 {
        bio->bi_next = NULL;
+       bio->bi_bdev = NULL;
        bio->bi_flags = 1 << BIO_UPTODATE;
        bio->bi_rw = 0;
        bio->bi_vcnt = 0;