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

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Message-ID: <aec7e5c30807110326s4b5cbad6j83ca0fe9db299f9@mail.gmail.com>
Date:	Fri, 11 Jul 2008 19:26:47 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"Uwe Kleine-König" <Uwe.Kleine-Koenig@...i.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

On Fri, Jul 11, 2008 at 7:18 PM, Uwe Kleine-König
<Uwe.Kleine-Koenig@...i.com> wrote:
> 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?

No, I'm not trying to solve anything like that. =)

The serialization code is only there to correctly handle multiple
processes/threads.

/ magnus
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