Unverified Commit d920440b authored Jun 27, 2024 by openeuler-ci-bot Committed by Gitee Jun 27, 2024

!9445 blk-cgroup: fix list corruption from reorder of WRITE ->lqueued

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/SA3KUDLAIM6QSAJ52CWGAU4VKFWMMY4A/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA7YKI 
 
Link:https://gitee.com/openeuler/kernel/pulls/9445

 

Reviewed-by: Zhang Peng <zhangpeng362@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Zhang Peng <zhangpeng362@huawei.com>

parents 9e194a9f aafddaef

block/blk-cgroup.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -1024,6 +1024,16 @@ static void __blkcg_rstat_flush(struct blkcg *blkcg, int cpu)
		struct blkg_iostat cur;
		unsigned int seq;

		/*
		* Order assignment of `next_bisc` from `bisc->lnode.next` in
		* llist_for_each_entry_safe and clearing `bisc->lqueued` for
		* avoiding to assign `next_bisc` with new next pointer added
		* in blk_cgroup_bio_start() in case of re-ordering.
		*
		* The pair barrier is implied in llist_add() in blk_cgroup_bio_start().
		*/
		smp_mb();

		WRITE_ONCE(bisc->lqueued, false);

		/* fetch the current per-cpu values */