linux-kernel - Re: [PATCH] wifi: mwifiex: Ensure all STA and AP use the same channel

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Message-ID: <192a1df2754eade22b68da5d8652dc996f2330e9.camel@sipsolutions.net>
Date: Fri, 30 Aug 2024 13:58:20 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Sascha Hauer <s.hauer@...gutronix.de>, Kalle Valo <kvalo@...nel.org>
Cc: Brian Norris <briannorris@...omium.org>, Francesco Dolcini
	 <francesco@...cini.it>, linux-wireless@...r.kernel.org, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] wifi: mwifiex: Ensure all STA and AP use the same
 channel

On Fri, 2024-08-30 at 13:04 +0200, Sascha Hauer wrote:
> 
> Related: num_different_channels is exposed to userspace, but outside the
> MAC80211 layer there is nothing in the kernel that enforces this
> restriction.  Am I missing something or is this just an open patch
> opportunity?
> 

It is, or was least was, non-trivial to do in cfg80211 since it
isn't/wasn't always fully aware of what's going on. mac80211 does this
by calling into some helper functions with an appropriate description of
what's happening, any other driver could do that too.

johannes