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Not fixing any bugs, just making it a bit easier to grok and ensuring that wait queue entry list status is consistent with iw->head always. If not on the list, head will be NULL. Also makes the removal consistent, by using a helper for that. This avoids IRQ saving/restoring, and it leaves the entry always in a sane state by using list_del_init() which remove_wait_queue() does not. -- Jens Axboe