linux-kernel - Re: [PATCH net-next 09/12] net: bcmgenet: return EOPNOTSUPP for unknown ioctl commands

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Date:   Tue, 14 Mar 2017 10:31:00 -0700
From:   Doug Berger <opendmb@...il.com>
To:     David Laight <David.Laight@...LAB.COM>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "rafal@...ecki.pl" <rafal@...ecki.pl>,
        "xow@...gle.com" <xow@...gle.com>,
        "joel@....id.au" <joel@....id.au>,
        "jon.mason@...adcom.com" <jon.mason@...adcom.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pgynther@...gle.com" <pgynther@...gle.com>,
        "jaedon.shin@...il.com" <jaedon.shin@...il.com>
Subject: Re: [PATCH net-next 09/12] net: bcmgenet: return EOPNOTSUPP for
 unknown ioctl commands

On 03/14/2017 04:04 AM, David Laight wrote:
> From: Doug Berger
>> Sent: 14 March 2017 00:42
>> This commit changes the ioctl handling behavior to return the
>> EOPNOTSUPP error code instead of the EINVAL error code when an
>> unknown ioctl command value is detected.
>>
>> It also removes some redundant parsing of the ioctl command value
>> and allows the SIOCSHWTSTAMP value to be handled.
> 
> A better description would seem to be:
> Remove checks on ioctl command and just forward all ioctl requests
> to phy_mii_ioctl().
That is a good description of the code change, but I felt that was
clearly conveyed by the patch content.  I thought it would be a better
use of the comment to describe the more subtle functional change that
might be less clear.

> 
> I also thought the 'generic' response to an unknown ioctl command
> was ENOTTY.
and I think it probably helped solicit this feedback :).  I would have
thought that error makes more sense if there is no ioctl handler, but I
will definitely look into it.

Thanks for the feedback,
    Doug