block: add sysfs knob for turning off disk entropy contributions

[linux.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index f0640d7f800f7164c5b04a59791410a029a48cc4..b4131d29148cefc2900a576201882a1a7fd8010d 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2111,7 +2111,8 @@ static bool blk_update_bidi_request(struct request *rq, int error,
            blk_update_request(rq->next_rq, error, bidi_bytes))
                return true;
 
-       add_disk_randomness(rq->rq_disk);
+       if (blk_queue_add_random(rq->q))
+               add_disk_randomness(rq->rq_disk);
 
        return false;
 }