1 files changed, 5 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 9315311c27a9..6dfbdde6b9ff 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1298,7 +1298,11 @@ void blk_account_io_start(struct request *rq)
 	if (!blk_do_io_stat(rq))
 		return;
 
-	rq->part = disk_map_sector_rcu(rq->rq_disk, blk_rq_pos(rq));
+	/* passthrough requests can hold bios that do not have ->bi_bdev set */
+	if (rq->bio && rq->bio->bi_bdev)
+		rq->part = rq->bio->bi_bdev;
+	else
+		rq->part = rq->rq_disk->part0;
 
 	part_stat_lock();
 	update_io_ticks(rq->part, jiffies, false);