linux-kernel - RE: [v5] wlcore: add missing nvs file name info for wilink8

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Date:   Tue, 8 Aug 2017 08:03:55 +0000
From:   "Reizer, Eyal" <eyalr@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Kalle Valo <kvalo@...eaurora.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sebastian.reichel@...labora.co.uk" 
        <sebastian.reichel@...labora.co.uk>,
        Julian Calaby <julian.calaby@...il.com>
Subject: RE: [v5] wlcore: add missing nvs file name info for wilink8

> Subject: Re: [v5] wlcore: add missing nvs file name info for wilink8
> 
> * Reizer, Eyal <eyalr@...com> [170807 00:47]:
> > Hi Tony,
> > >
> > > * Reizer, Eyal <eyalr@...com> [170807 00:32]:
> > > > The following commits:
> > > > c815fde wlcore: spi: Populate config firmware data
> > > > d776fc8 wlcore: sdio: Populate config firmware data
> > > >
> > > > Populated the nvs entry for wilink6 and wilink7 only while it is
> > > > still needed for wilink8 as well.
> > > > This broke user space backward compatibility when upgrading from
> older
> > > > kernels, as the alternate mac address would not be read from the nvs
> that
> > > is
> > > > present in the file system (lib/firmware/ti-connectivity/wl1271-nvs.bin)
> > > > causing mac address change of the wlan interface.
> > > >
> > > > This patch fix this and update the structure field with the same default
> > > > nvs file name that has been used before.
> > > >
> > > > In addition, some distros hold a default wl1271-nvs.bin in the file
> > > > system with a bogus mac address (deadbeef...) that for a wl18xx device
> > > > also overrides the mac address that is stored inside the device.
> > > > Warn users about this bogus mac address and use a random mac
> instead
> > >
> > > Hmm looks pretty good to me except for one more thing I just noticed.
> > >
> > > Why don't you just use the hardware mac address instead of a random
> > > mac address on wl18xx device when you see a bogus nvs file?
> > >
> >
> > I agree that this would have been better but the problem is that hardware
> > mac address is available for wilink8 onlyWilink6/7 don't have one stored.
> > The wlcore code responsible for handling mac address is common code
> > and there is method for detecting between them in this module.
> 
> Care to clarify a bit.. Are you saying wilink8 will use the hardware
> mac address in case of bogus nvs file?
> 
With present implementation it will not. It will use the random one for both 
wilink6/7 as well as wilink8.
I need to get a hold of a wilink6/7 module and see if reverting to an internal 
mac address is working. Will try to look around as it has been a while since 
I used one.

Best Regards,
Eyal