linux-kernel - Re: [PATCH 1/1] UIO: Add a write() function to enable/disable interrupts

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Message-ID: <20080604063005.GA22952@digi.com>
Date:	Wed, 4 Jun 2008 08:30:05 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	Hans-Jürgen Koch <hjk@...utronix.de>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	<linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jan Altenberg <jan.altenberg@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [PATCH 1/1] UIO: Add a write() function to enable/disable interrupts

Hello Hans-Jürgen,

> Sometimes it is necessary to enable/disable the interrupt of a UIO device
> from the userspace part of the driver. With this patch, the UIO kernel driver
> can implement an "irqcontrol()" function that does this. Userspace can write
> an s32 value to /dev/uioX (usually 0 or 1 to turn the irq off or on). The
> UIO core will then call the driver's irqcontrol function.
IMHO it would make sense to demand that irqcontrol() is idempotent and
then call irqcontrol(ON) before blocking in read and poll.

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
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