linux-kernel - Re: [RFC] Remove or convert empty ioctls ?

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Date:	Thu, 15 Oct 2009 11:35:45 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC] Remove or convert empty ioctls ?

On 10/15/2009 11:31 AM, Alan Cox wrote:
> EINVAL means you used an ioctl that is correct for the driver but that
> for some reason the driver didn't like it.

Precisely.

The driver author proactively chose to implement the ioctl and return a 
value other than ENOTTY.

It is invalid to assume that all such cases are a direct result of 
author mistakes or ignorance.

	Jeff



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