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blk-wbt: make sure throttle is enabled properly 

[ Upstream commit 76a8040817b4b9c69b53f9b326987fa891b4082a ]

After commit a79050434b ("blk-rq-qos: refactor out common elements of
blk-wbt"), if throttle was disabled by wbt_disable_default(), we could
not enable again, fix this by set enable_state back to
WBT_STATE_ON_DEFAULT.

Fixes: a79050434b ("blk-rq-qos: refactor out common elements of blk-wbt")
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://lore.kernel.org/r/20210619093700.920393-3-yi.zhang@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Yi 2021-06-19 17:37:00 +08:00 committed by Greg Kroah-Hartman
parent bcf3f42bda
commit 7b33b04f85
1 changed files with 5 additions and 1 deletions
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6
block/blk-wbt.c
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@ -645,9 +645,13 @@ void wbt_set_write_cache(struct request_queue *q, bool write_cache_on)
void wbt_enable_default(struct request_queue *q)
{
struct rq_qos *rqos = wbt_rq_qos(q);
/* Throttling already enabled? */
if (rqos)
if (rqos) {
if (RQWB(rqos)->enable_state == WBT_STATE_OFF_DEFAULT)
RQWB(rqos)->enable_state = WBT_STATE_ON_DEFAULT;
return;
}
/* Queue not registered? Maybe shutting down... */
if (!blk_queue_registered(q))