linux-kernel - Re: [PATCH] timerfd/eventfd context lock doesn't protect against poll

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Date:	Thu, 17 May 2007 23:20:05 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Davi Arnaut <davi@...ent.com.br>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] timerfd/eventfd context lock doesn't protect against
 poll_wait

On Fri, 18 May 2007, Davi Arnaut wrote:

> Hi,
> 
> poll_wait() callback may modify the waitqueue without holding the
> context private lock.

Thx Davi, patch is correct. Nice catch. But at this point instead of 
ending up getting two locks, we may look into using Andrew suggestion of 
reusing the waitqueue lock. Is it universally considered a "legal" 
operation?


- Davide


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