block: re-use existing 'reading' variable instead of checking direction again

Signed-off-by: majianpeng <majianpeng@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-map.c b/block/blk-map.c
index 164cd0059706214e53c01b780b353fca98d9b829..623e1cd4cffe997e71fbb54577bd42f220af64b3 100644 (file)
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -311,7 +311,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf,
        if (IS_ERR(bio))
                return PTR_ERR(bio);
 
-       if (rq_data_dir(rq) == WRITE)
+       if (!reading)
                bio->bi_rw |= REQ_WRITE;
 
        if (do_copy)