tree aa96ff045ce70790592c50d16d50bb95a185b264
parent 05ce7fb946c37fc6fc8bf14073279e570f78f69e
author Guoqing Jiang <guoqing.jiang@linux.dev> 1655781089 +0800
committer Jens Axboe <axboe@kernel.dk> 1659482080 -0600

md: unlock mddev before reap sync_thread in action_store

Since the bug which commit 8b48ec23cc51a ("md: don't unregister sync_thread
with reconfig_mutex held") fixed is related with action_store path, other
callers which reap sync_thread didn't need to be changed.

Let's pull md_unregister_thread from md_reap_sync_thread, then fix previous
bug with belows.

1. unlock mddev before md_reap_sync_thread in action_store.
2. save reshape_position before unlock, then restore it to ensure position
   not changed accidentally by others.

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>