linux-kernel - RE: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA running on different channel

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Message-ID:
 <PA4PR04MB963813D69B4D87B7147704A5D19A2@PA4PR04MB9638.eurprd04.prod.outlook.com>
Date: Tue, 10 Sep 2024 01:55:14 +0000
From: David Lin <yu-hao.lin@....com>
To: Sascha Hauer <s.hauer@...gutronix.de>
CC: "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"briannorris@...omium.org" <briannorris@...omium.org>, "kvalo@...nel.org"
	<kvalo@...nel.org>, "francesco@...cini.it" <francesco@...cini.it>, Pete Hsieh
	<tsung-hsien.hsieh@....com>
Subject: RE: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA running on
 different channel

> From: Sascha Hauer <s.hauer@...gutronix.de>
> Sent: Tuesday, September 10, 2024 4:33 AM
> To: David Lin <yu-hao.lin@....com>
> Cc: linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org;
> briannorris@...omium.org; kvalo@...nel.org; francesco@...cini.it; Pete
> Hsieh <tsung-hsien.hsieh@....com>
> Subject: Re: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA running on
> different channel
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
> 
> 
> On Mon, Sep 02, 2024 at 10:35:01AM +0000, David Lin wrote:
> > > From: Sascha Hauer <s.hauer@...gutronix.de>
> > > Sent: Monday, September 2, 2024 5:38 PM
> > > To: David Lin <yu-hao.lin@....com>
> > > Cc: linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org;
> > > briannorris@...omium.org; kvalo@...nel.org; francesco@...cini.it;
> > > Pete Hsieh <tsung-hsien.hsieh@....com>
> > > Subject: [EXT] Re: [PATCH v2] wifi: mwifiex: avoid AP and STA
> > > running on different channel
> > >
> > > On Mon, Sep 02, 2024 at 04:43:11PM +0800, David Lin wrote:
> > > > Current firmware doesn't support AP and STA running on different
> > > > channels simultaneously.
> > >
> > > As mentioned here:
> > >
> > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flo
> > >
> re.kern%2F&data=05%7C02%7Cyu-hao.lin%40nxp.com%7C7712df39ac37414fd
> a7
> > >
> e08dcd10eac35%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6386
> 15108
> > >
> 157502805%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV
> 2luMz
> > >
> IiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=URNJPJE17iRY
> Tu4i
> > > rx7eQAC97tE5OE6a4kUfjUwuaVU%3D&reserved=0
> > >
> el.org%2Fall%2FZtGnWC7SPHt7Vbbp%40pengutronix.de%2F&data=05%7C02%
> > >
> 7Cyu-hao.lin%40nxp.com%7Cce9b7d4e417c41113c7d08dccb32fc49%7C686ea
> > >
> 1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638608667089710854%7CUnkn
> > >
> own%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h
> > >
> aWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=nMZO565xCUO%2BwxD4tIfi
> > > w6cGyYrinaEsi7XLfqyxgXg%3D&reserved=0
> > >
> > > AP and STA can indeed have different channels when DRCS is enabled,
> > > so I think you have to check this in your patch.
> > >
> > > Maybe the same question here again: Wouldn't it make sense to enable
> > > DRCS by default?
> > >
> > > Sascha
> > >
> >
> > I will look into DRCS support later after current tasks on hand.
> > This patch is a quick fix to avoid firmware crash in the specific scenario.
> 
> With DRCS support enabled AP and STA actually can run on different channels
> with the current code. You are breaking this scenario with this patch.
> 
> Sascha
> 

DRCS will be checked in the future.

David