linux-kernel - Re: [patch 13/13] signalfd/timerfd/asyncfd v5 - KAIO asyncfd support (example/maybe-broken) ...

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Message-ID: <Pine.LNX.4.64.0703141646020.4982@alien.or.mcafeemobile.com>
Date:	Wed, 14 Mar 2007 16:49:10 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Benjamin LaHaise <bcrl@...ck.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [patch 13/13] signalfd/timerfd/asyncfd v5 - KAIO asyncfd support
 (example/maybe-broken) ...

On Wed, 14 Mar 2007, Davide Libenzi wrote:

> On Wed, 14 Mar 2007, Benjamin LaHaise wrote:
> 
> > On Wed, Mar 14, 2007 at 04:24:54PM -0700, Davide Libenzi wrote:
> > > Can you point me to a kernel path that ends up calling aio_complete() in a 
> > > do-not-sleep mode?
> > 
> > If you remove that invariant, then it is very difficult for device drivers 
> > and other code to make use of aio_complete().
> > 
> > > The offender I see is drivers/usb/gadget/inode.c that calls it with a 
> > > spinlock held.
> > 
> > Which was from irq context last time I checked.

The drivers/usb/gadget/inode.c case seems to be easily fixeable AFAICS, in 
the ep_aio_complete() function.
I was more under the impression that aio_complete() was more of a tasklet 
kind of domain.



- Davide


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