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由 NeilBrown 提交于
Re-checking the faulty flag here brings no value. The comment about "risk" refers to the risk that the device could be in the process of being removed by ->hot_remove_disk(). However providing that the ->nr_pending count is incremented inside an rcu_read_locked() region, there is no risk of that happening. This is because the rdev pointer (in the personalities array) is set to NULL before synchronize_rcu(), and ->nr_pending is tested afterwards. If the rcu_read_locked region happens before the synchronize_rcu(), the test will see that nr_pending has been incremented. If it happens afterwards, the rdev pointer will be NULL so there is nothing to increment. Signed-off-by: NNeilBrown <neilb@suse.com> Signed-off-by: NShaohua Li <shli@fb.com>
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