linux-kernel - Re: [PATCH] staging: comedi: replace ENOSYS by proper error codes

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Message-ID: <20150612234656.GB11536@kroah.com>
Date:	Fri, 12 Jun 2015 16:46:56 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	devel@...verdev.osuosl.org, hamohammed.sa@...il.com,
	tapaswenipathak@...il.com, linux-kernel@...r.kernel.org,
	hsweeten@...ionengravers.com, abbotti@....co.uk,
	julien.dehee@...il.com, viro@...iv.linux.org.uk
Subject: Re: [PATCH] staging: comedi: replace ENOSYS by proper error codes

On Fri, Jun 12, 2015 at 03:26:26PM -0700, Greg KH wrote:
> On Fri, Jun 12, 2015 at 10:06:16PM +0100, One Thousand Gnomes wrote:
> > On Fri, 12 Jun 2015 13:43:27 -0700
> > Greg KH <gregkh@...uxfoundation.org> wrote:
> > 
> > > On Fri, Jun 12, 2015 at 10:20:38PM +0200, julien.dehee@...il.com wrote:
> > > > From: Julien Dehee <julien.dehee@...il.com>
> > > > 
> > > > comedi/comedi_fops.c
> > > >     use ENODEV following open manual
> > 
> > That should probably be ENXIO by a strict reading, but Linux has always
> > used ENODEV 8)
> > 
> > > > 
> > > > comedi/drivers.c
> > > >     use ENOTTY following ioctl manual
> > > > 
> > > > drivers/serial2002.c
> > > >     use ENOTTY following ioctl manual
> > > 
> > > What do you mean by "ioctl manual"?
> > 
> > man 2 ioctl
> > 
> > Unknown ioctls on a device should error with ENOTTY. It's one of
> > those crazy pieces of Unix history.
> 
> Note that the man 2 ioctl interface is not always what the kernel
> exposes, but rather, what your libc exposes to other programs.  So
> setting these kernel values might not change what you get all the way
> through, have you tested it?

We also have the issue of the existing userspace comedi code, I don't
know if it's handling the ioctl errors differently than ioctl(2) says,
but that should be checked as well before I can take this patch.

thanks,

greg k-h
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