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authorAleksei Zakharov <zakharov.a.g@yandex.ru>2019-02-11 13:10:34 +0300
committerJens Axboe <axboe@kernel.dk>2019-02-11 08:20:14 -0700
commitb7143fe67bfc3b83a9e11371da659e1e70a1bbf3 (patch)
tree97680f2159fc96f58d83743844ab1b1d1f025cb1 /block
parent0586942f03b71bc95b0ee356ff6b09d53acbad06 (diff)
downloadlinux-stericsson-b7143fe67bfc3b83a9e11371da659e1e70a1bbf3.tar.gz
block: avoid setting wbt_lat_usec to current value
There's no reason to set wbt min lat and freeze request queue if current value is the same. Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-sysfs.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 94e1b052abbc..59685918167e 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -468,6 +468,9 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
else if (val >= 0)
val *= 1000ULL;
+ if (wbt_get_min_lat(q) == val)
+ return count;
+
/*
* Ensure that the queue is idled, in case the latency update
* ends up either enabling or disabling wbt completely. We can't