[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>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/bio.c b/fs/bio.c
index dfe242a21eb4..7b3069589951 100644
--- 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;