diff options
Diffstat (limited to 'block/blk-wbt.c')
| -rw-r--r-- | block/blk-wbt.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/block/blk-wbt.c b/block/blk-wbt.c index dcc2438ca16d..953d400fd013 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -813,6 +813,21 @@ static void wbt_queue_depth_changed(struct rq_qos *rqos) wbt_update_limits(RQWB(rqos)); } +static bool wbt_set_lat_changed(struct request_queue *q, u64 val) +{ + struct rq_qos *rqos = wbt_rq_qos(q); + struct rq_wb *rwb; + + if (!rqos) + return true; + + rwb = RQWB(rqos); + if (rwb->min_lat_nsec != val) + return true; + + return rwb_enabled(rwb) != !!val; +} + static void wbt_exit(struct rq_qos *rqos) { struct rq_wb *rwb = RQWB(rqos); @@ -1005,8 +1020,12 @@ int wbt_set_lat(struct gendisk *disk, s64 val) else if (val >= 0) val *= 1000ULL; - if (wbt_get_min_lat(q) == val) + mutex_lock(&disk->rqos_state_mutex); + if (!wbt_set_lat_changed(q, val)) { + mutex_unlock(&disk->rqos_state_mutex); goto out; + } + mutex_unlock(&disk->rqos_state_mutex); blk_mq_quiesce_queue(q); |