linux-kernel - Re: [PATCH] uio: uio_pdrv

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Message-ID: <20080711101839.GA26106@digi.com>
Date:	Fri, 11 Jul 2008 12:18:39 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	Magnus Damm <magnus.damm@...il.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hjk@...utronix.de" <hjk@...utronix.de>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] uio: uio_pdrv_genirq V3

Magnus Damm wrote:
>   - kept irq control spinlock to serialize user space access
I think you want to assert, that after a succeeded

	echo 0 > /dev/uioX

the userspace doesn't need to check for a pending irq?!  What happens if
the irq triggers before you take the lock?

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
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