linux-kernel - Re: [PATCH] ath10k: retrieve MAC address from firmware if provided

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 03 Sep 2018 19:49:58 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        govinds@...eaurora.org, linux-wireless@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        ath10k@...ts.infradead.org
Subject: Re: [PATCH] ath10k: retrieve MAC address from firmware if provided

Brian Norris <briannorris@...omium.org> writes:

> On Tue, Aug 28, 2018 at 05:33:01PM +0300, Kalle Valo wrote:
>> Arend van Spriel <arend.vanspriel@...adcom.com> writes:
>> 
>> > On 8/13/2018 7:14 PM, Brian Norris wrote:
>> >> On Sat, Aug 11, 2018 at 11:26 AM Arend van Spriel
>> >> <arend.vanspriel@...adcom.com> wrote:
>> >>>
>> >>> On 8/11/2018 1:39 AM, Brian Norris wrote:
>> >>>> Devices may provide their own MAC address via system firmware (e.g.,
>> >>>
>> >>> You got me confused by using just "firmware" in the subject.
>> >>
>> >> Yeah...I started by writing this patch with device tree specifically
>> >> (of_get_mac_address()), and then later found that there were generic
>> >> "device" helpers for this, which can assist with other sorts of
>> >> firmware nodes. It was easier to put a name on a device tree patch
>> >> than on a "device" patch. I suppose "system firmware" might be a
>> >> better description?
>> >>
>> >>>> device tree), especially in the case where the device doesn't have a
>> >>>> useful EEPROM on which to store its MAC address (e.g., for integrated
>> >>>> Wifi).
>> >>>>
>> >>>> Use the generic device helper to retrieve the MAC address, and (if
>> >>>> present) honor it above the MAC address advertised by the card.
>> >>>
>> >>> But this put me back on track ;-)
>> >>
>> >> Let me know if you have a better way to clarify. I can resend with a
>> >> slightly modified subject (s/firmware/system firmware/), or let Kalle
>> >> do it, if that's the only thing to change.
>> >
>> > "system firmware" substitution works for me.
>> 
>> What about:
>> 
>> ath10k: retrieve MAC address from Device Tree if provided
>> 
>> Because from ath10k point of view we use Device Tree functions and don't
>> care if it's delivered by pidgeons or by system firmware :)
>
> I don't care too much, but note that Device Tree is a loaded term,
> usually referring specifically to a method of describing system hardware
> via the Flattened Device Tree format. If I were specifically targeting
> Device Tree, I'd use helpers like of_get_mac_address() instead. (The
> 'of_*' prefix is a relic of OpenFirmware, an early firmware
> implementation that used the Device Tree format.)

My bad, I read your patch hastily and somehow understood you were using
of_get_mac_address() but you were actually using
device_get_mac_address(). So I'll change this to "system firmware" as
originally suggested.

Sorry for the confusion.

-- 
Kalle Valo