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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