md/raid10: fix io hung in md_wait_for_blocked_rdev()
hulk inclusion category: bugfix bugzilla: 188569, https://gitee.com/openeuler/kernel/issues/I6XBZQ CVE: NA -------------------------------- If badblocks are merged but bb->count exceedded, badblocks_set() will return 1 and merged badblocks will become un-ack. rdev_set_badblocks() will not set sb_flags and wakeup mddev->thread, io wait in md_wait_for_blocked_rdev() will hung because BlockedBadBlocks may not be cleared. Fix it by checking badblocks->changed instead of return value. This flag is set when badblocks changes. Signed-off-by: NLi Nan <linan122@huawei.com> Reviewed-by: NYu Kuai <yukuai3@huawei.com> Reviewed-by: NHou Tao <houtao1@huawei.com>
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