linux-kernel - Re: [BUG] iwlwifi: card unusable after firmware crash

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Date:   Wed, 9 Dec 2020 20:02:16 +0000
From:   "Coelho, Luciano" <luciano.coelho@...el.com>
To:     "Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "Goodstein, Mordechay" <mordechay.goodstein@...el.com>,
        "Berg, Johannes" <johannes.berg@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rsalvaterra@...il.com" <rsalvaterra@...il.com>
Subject: Re: [BUG] iwlwifi: card unusable after firmware crash

Hi Jakub et al,

On Wed, 2020-12-09 at 09:13 -0800, Jakub Kicinski wrote:
> On Tue, 8 Dec 2020 23:17:48 +0000 Rui Salvaterra wrote:
> > Hi, Luca,
> > 
> > On Tue, 8 Dec 2020 at 16:27, Coelho, Luciano <luciano.coelho@...el.com> wrote:
> > > On Tue, 2020-12-08 at 11:27 +0000, Rui Salvaterra wrote:  
> > > > 
> > > > [ 3174.003910] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio.
> > > > [ 3174.003913] iwlwifi 0000:02:00.0: reporting RF_KILL (radio disabled)  
> > > 
> > > It looks like your machine is reporting RF-Kill to the WiFi device.  
> > 
> > Yes, that's an artifact of how I tested: I rebooted the router, the
> > Wi-Fi interface disassociated and the dmesg was clean. However, after
> > the router came up, the laptop didn't reconnect (and the connection
> > had completely disappeared from nmtui). Afterwards, I did the rfkill
> > cycle you see, and only then I got the register dump.
> > 
> > > There seems to be some sort of race there that is causing us to still
> > > try to communicate with the device (and thus you see the transaction
> > > failed dump), but that will obviously fail when RF-Kill is enabled.  
> > 
> > I'm not sure about that, the card was already dead before the rfkill cycle.
> 
> Any luck figuring this out, Luca? If this is a 5.10 regression we need
> to let Linus know tomorrow, so the time is ticking :(

I just checked all the commits in iwlwifi between v5.9 and v5.10 and I
don't see anything that could affect how RF-Kill works.

Emmanuel, do you remember anything that went in that could have
affected RF-Kill?

--
Cheers,
Luca.