From: Christoph Hellwig hch@lst.de
[ Upstream commit 9df3e65139b923dfe98f76b7057882c7afb2d3e4 ]
Just directly dereference the disk name instead of going through multiple hoops to find the same value.
Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Andreas Herrmann aherrmann@suse.de Acked-by: Tejun Heo tj@kernel.org Link: https://lore.kernel.org/r/20220921180501.1539876-10-hch@lst.de Signed-off-by: Jens Axboe axboe@kernel.dk Stable-dep-of: d36a9ea5e776 ("block: fix use-after-free of q->q_usage_counter") Signed-off-by: Sasha Levin sashal@kernel.org --- block/blk-iocost.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 069193dee95b..f5b501888ba4 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -665,17 +665,13 @@ static struct ioc *q_to_ioc(struct request_queue *q) return rqos_to_ioc(rq_qos_id(q, RQ_QOS_COST)); }
-static const char *q_name(struct request_queue *q) -{ - if (blk_queue_registered(q)) - return kobject_name(q->kobj.parent); - else - return "<unknown>"; -} - static const char __maybe_unused *ioc_name(struct ioc *ioc) { - return q_name(ioc->rqos.q); + struct gendisk *disk = ioc->rqos.q->disk; + + if (!disk) + return "<unknown>"; + return disk->disk_name; }
static struct ioc_gq *pd_to_iocg(struct blkg_policy_data *pd)