diff options
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index f0ca569e276b..a97841491769 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -425,20 +425,30 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, ssize_t ret; s64 val; - rwb = q->rq_wb; - if (!rwb) - return -EINVAL; - ret = queue_var_store64(&val, page); if (ret < 0) return ret; + if (val < -1) + return -EINVAL; + + rwb = q->rq_wb; + if (!rwb) { + ret = wbt_init(q); + if (ret) + return ret; + + rwb = q->rq_wb; + if (!rwb) + return -EINVAL; + } if (val == -1) rwb->min_lat_nsec = wbt_default_latency_nsec(q); else if (val >= 0) rwb->min_lat_nsec = val * 1000ULL; - else - return -EINVAL; + + if (rwb->enable_state == WBT_STATE_ON_DEFAULT) + rwb->enable_state = WBT_STATE_ON_MANUAL; wbt_update_limits(rwb); return count; |