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

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Message-ID: <20070314231920.GB1246@kvack.org>
Date:	Wed, 14 Mar 2007 19:19:20 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Davide Libenzi <davidel@...ilserver.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, Mar 14, 2007 at 03:19:21PM -0700, Davide Libenzi wrote:
> +	/*
> +	 * Check if the user asked us to deliver the result through an
> +	 * asyncfd. Note that asyncfd_add_results() may sleep. It seems
> +	 * OK looking at the code, but I'm not sure since inside a USB driver,
> +	 * aio_complete() is called with a spinlock held. !!CHECK
> +	 */

That won't work.  aio_complete() is supposed to be irq safe.

		-ben
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