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md: Hold mddev->reconfig_mutex when trying to get mddev->sync_thread

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Commit ba9d9f1a707f ("Revert "md: unlock mddev before reap sync_thread in
action_store"") removed the scenario of calling md_unregister_thread()
without holding mddev->reconfig_mutex, so add a lock holding check before
acquiring mddev->sync_thread by passing mdev to md_unregister_thread().

Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20230803071711.2546560-1-lilingfeng@huaweicloud.com
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Li Lingfeng
2023-08-03 15:17:11 +08:00
committed by Song Liu
parent 892da88d1c
commit 7eb8ff02c1
7 changed files with 15 additions and 14 deletions
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2
drivers/md/raid5-cache.c
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@@ -3168,7 +3168,7 @@ void r5l_exit_log(struct r5conf *conf)
{
struct r5l_log *log = conf->log;
md_unregister_thread(&log->reclaim_thread);
md_unregister_thread(conf->mddev, &log->reclaim_thread);
/*
* 'reconfig_mutex' is held by caller, set 'confg->log' to NULL to