linux-kernel - Re: [Xen-devel] [PATCH 1/3] xen/privcmd: return -ENOSYS for unimplemented IOCTLs

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Date:   Thu, 09 Feb 2017 07:40:17 -0700
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "Paul Durrant" <paul.durrant@...rix.com>
Cc:     <xen-devel@...ts.xenproject.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        "Juergen Gross" <JGross@...e.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/3] xen/privcmd: return -ENOSYS for
 unimplemented IOCTLs

>>> On 09.02.17 at 15:17, <paul.durrant@...rix.com> wrote:
> The code goes so far as to set the default return code to -ENOSYS but
> then overrides this to -EINVAL in the switch() statement's default
> case.

If you already change this, isn't -ENOTTY the traditional way of
indicating unsupported ioctls?

Jan