linux-kernel - Re: [PATCH] [media] v4l2 core: return -ENOIOCTLCMD if an ioctl doesn't exist

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Message-Id: <201106262152.53096.arnd@arndb.de>
Date:	Sun, 26 Jun 2011 21:52:52 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Sakari Ailus <sakari.ailus@....fi>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] [media] v4l2 core: return -ENOIOCTLCMD if an ioctl doesn't exist

On Sunday 26 June 2011 20:51:37 Mauro Carvalho Chehab wrote:
> > 
> > I mean what do you return to vfs_ioctl from v4l? The conversions must
> > have been long before we introduced compat_ioctl and ENOIOCTLCMD.
> > 
> > As far as I can tell, video_ioctl2 has always converted ENOIOCTLCMD into
> > EINVAL, so changing the vfs functions would not have any effect.
> 
> Yes.  This discussion was originated by a RFC patch proposing to change 
> video_ioctl2 to return -ENOIOCTLCMD instead of -EINVAL.

Ok, I see. So returning -ENOIOCTLCMD is not an option IMHO, but if you
are confident that it doesn't break anything, returning -ENOTTY would
be possible and doesn't require any core changes.

	Arnd
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