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blk-sysfs: remove NULL pointer checking in queue_wb_lat_store 

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@didichuxing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
weiping zhang 2017-11-23 21:39:40 +08:00 committed by Jens Axboe
parent 612ea091fc
commit f680474345
1 changed files with 1 additions and 4 deletions
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5
block/blk-sysfs.c
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@ -450,12 +450,9 @@ 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)