linux-kernel - Re: [PATCH 4/6] net: add NL802154 interface for configuration of 802.15.4 devices

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Message-Id: <20090603.030911.162861804.davem@davemloft.net>
Date:	Wed, 03 Jun 2009 03:09:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	dbaryshkov@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
	sfr@...b.auug.org.au, slapin@...fans.org
Subject: Re: [PATCH 4/6] net: add NL802154 interface for configuration of
 802.15.4 devices

From: Johannes Berg <johannes@...solutions.net>
Date: Wed, 03 Jun 2009 11:39:24 +0200

> On Wed, 2009-06-03 at 13:33 +0400, Dmitry Eremin-Solenikov wrote:
> 
>> +enum {
>> +	__IEEE802154_COMMAND_INVALID,
>> +
>> +	IEEE802154_ASSOCIATE_REQ,
>> +	IEEE802154_ASSOCIATE_CONF,
>> +	IEEE802154_DISASSOCIATE_REQ,
>> +	IEEE802154_DISASSOCIATE_CONF,
>> +	IEEE802154_GET_REQ,
>> +	IEEE802154_GET_CONF,
>> +/* 	IEEE802154_GTS_REQ, */
>> +/* 	IEEE802154_GTS_CONF, */
>> +	IEEE802154_RESET_REQ,
>> +	IEEE802154_RESET_CONF,
>> +/* 	IEEE802154_RX_ENABLE_REQ, */
>> +/* 	IEEE802154_RX_ENABLE_CONF, */
> 
> This is a recipe for disaster. Somebody will come along and uncomment
> things. Why this is bad, I leave as an exercise for the reader.

Right, it changes the other request numbers and breaks userspace.

Dmitry you have to pick these numbers as fixed numbers now and do
so in such a way that they will remain unchanged forever because
they are part of the user visible interface.
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