netdev - Re: [cfg80211 / iwlwifi] setting wireless regulatory domain doesn't work.

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Message-ID: <52B167F6.5060209@broadcom.com>
Date:	Wed, 18 Dec 2013 10:16:38 +0100
From:	Arend van Spriel <arend@...adcom.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sander Eikelenboom <linux@...elenboom.it>
CC:	Ben Hutchings <ben@...adent.org.uk>,
	Julian Calaby <julian.calaby@...il.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	"Berg, Johannes" <johannes.berg@...el.com>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>,
	Avinash Patil <avinashapatil@...il.com>
Subject: Re: [cfg80211 / iwlwifi] setting wireless regulatory domain doesn't
 work.

On 12/17/2013 11:06 PM, Linus Torvalds wrote:
> We have literally had this *exact* same issue with firmware loading.
> Network drivers shouldn't try to load firmware at module load time.
> Same deal.

It is kind of a chicken and egg problem for (wireless) networking
drivers. To get IFF_UP from the network layer you have to register a
netdevice. For wireless drivers this means you have to register a wiphy
device with cfg80211 which flags capabilities and optionally are custom
regulatory domain. That information depends on the device and firmware
used. And there we have a full circle.

Regards,
Arend
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