bsg: setting rq->bio to NULL

Due to commit 1cd96c242a829d52f7a5ae98f554ca9775429685 ("block: WARN
in __blk_put_request() for potential bio leak"), BSG SMP requests get
the false warnings:

WARNING: at block/blk-core.c:1068 __blk_put_request+0x52/0xc0()

This sets rq->bio to NULL to avoid that false warnings.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/block/bsg.c b/block/bsg.c
index 206060e795da..dd81be455e00 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -315,6 +315,7 @@ out:
         blk_put_request(rq);
         if (next_rq) {
                 blk_rq_unmap_user(next_rq->bio);
+                next_rq->bio = NULL;
                 blk_put_request(next_rq);
         }
         return ERR_PTR(ret);
@@ -448,6 +449,7 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
                 hdr->dout_resid = rq->data_len;
                 hdr->din_resid = rq->next_rq->data_len;
                 blk_rq_unmap_user(bidi_bio);
+                rq->next_rq->bio = NULL;
                 blk_put_request(rq->next_rq);
         } else if (rq_data_dir(rq) == READ)
                 hdr->din_resid = rq->data_len;
@@ -466,6 +468,7 @@ static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
         blk_rq_unmap_user(bio);
         if (rq->cmd != rq->__cmd)
                 kfree(rq->cmd);
+        rq->bio = NULL;
         blk_put_request(rq);
 
         return ret;