[PATCH] Fix race in epoll_ctl(EPOLL_CTL_MOD)
From: Davide Libenzi <davidel@xmailserver.org> A potential race can happen in epoll_ctl(EPOLL_CTL_MOD) where an event can happen in between f_op->poll() and the lock on ep->lock (we cannot call f_op->poll() inside a lock, and the f_op->poll() callback does not carry any info at the current time - missing wake_up_info() already ;). In that case the event would be removed. We can easily leave the event inside the ready list and have the ep_send_events() logic do the job for us at later time. (Thanks to david.lee@teracruz.com for reporting the thing, since it shouldn't have been a nice one ;)
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