wbt_init doesn't set q->rq_wb to NULL, if wbt_init return 0, so check return value is enough, remove NULL checking. Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx> --- block/blk-sysfs.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index b8362c0..9b1093a 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -449,12 +449,9 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, ret = wbt_init(q); if (ret) return ret; - - rwb = q->rq_wb; - if (!rwb) - return -EINVAL; } + rwb = q->rq_wb; if (val == -1) rwb->min_lat_nsec = wbt_default_latency_nsec(q); else if (val >= 0) -- 2.9.4
