Re: [RFC,PATCH] use rcu for fasync_lock

From: Manfred Spraul
Date: Sun Dec 21 2003 - 10:01:31 EST


Jamie Lokier wrote:

I don't think you need to change pollwait or ->poll, because the band
information for the signal is available, as you say, by calling ->poll
after the wakeup.

I'm not convinced:
The wakeup happens at irq time. The band info is necessary for send_sigio(). Calling f_poll at irq time is not an option - it will definitively cause breakage. schedule_work() for every call is IMHO not an option. And even that is not reliable: fasync users might expect seperate POLL_OUT and POLL_IN signals.


--
Manfred


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