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dm raid: protect md_stop() with 'reconfig_mutex'
[ Upstream commit 7d5fff8 ] __md_stop_writes() and __md_stop() will modify many fields that are protected by 'reconfig_mutex', and all the callers will grab 'reconfig_mutex' except for md_stop(). Also, update md_stop() to make certain 'reconfig_mutex' is held using lockdep_assert_held(). Fixes: 9d09e66 ("dm: raid456 basic support") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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