linux-kernel - Re: [PATCH ath-next] wifi: ath10k: switch to of_get_mac

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Message-ID: <CAKxU2N8=B8JHNppr+RbOBbzBztXs1f2wLVn3ZtwDHSpokCNf0Q@mail.gmail.com>
Date: Mon, 11 Aug 2025 13:25:11 -0700
From: Rosen Penev <rosenp@...il.com>
To: Jeff Johnson <jeff.johnson@....qualcomm.com>
Cc: linux-wireless@...r.kernel.org, Jeff Johnson <jjohnson@...nel.org>, 
	"open list:QUALCOMM ATHEROS ATH10K WIRELESS DRIVER" <ath10k@...ts.infradead.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH ath-next] wifi: ath10k: switch to of_get_mac_address

On Mon, Aug 11, 2025 at 12:55 PM Jeff Johnson
<jeff.johnson@....qualcomm.com> wrote:
>
> On 8/8/2025 8:15 PM, Rosen Penev wrote:
> > In 9d5804662ce1f9bdde0a14c3c40940acbbf09538 , device_get_mac_address was
>
> see
> https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
>
> specifically: If you want to refer to a specific commit, don’t just refer to
> the SHA-1 ID of the commit. Please also include the oneline summary of the
> commit, to make it easier for reviewers to know what it is about.
>
> So in this case:
> 9d5804662ce1 ("ath10k: retrieve MAC address from system firmware if provided")
>
> > introduced as a generic way to get MAC addresses from anywhere.
> > Unfortunately since then, the landscape has changed and the OF version
>
> when did the landscape change? if using device_get_mac_address() is breaking
> folks, it would be nice to know which versions of the kernel have the bad
> behavior so that the patch can be backported to any broken LTS kernels.
>
> > is required for NVMEM support. The second problem is that with NVMEM
> > it's possible that it loads after ath10k. For that reason, check for
> > deferred errors and exit out of probe in such a case.
> >
> > Signed-off-by: Rosen Penev <rosenp@...il.com>
> > ---
> >  drivers/net/wireless/ath/ath10k/core.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
> > index 6f78f1752cd6..76747eb0925b 100644
> > --- a/drivers/net/wireless/ath/ath10k/core.c
> > +++ b/drivers/net/wireless/ath/ath10k/core.c
> > @@ -11,6 +11,7 @@
> >  #include <linux/module.h>
> >  #include <linux/firmware.h>
> >  #include <linux/of.h>
> > +#include <linux/of_net.h>
> >  #include <linux/property.h>
> >  #include <linux/dmi.h>
> >  #include <linux/ctype.h>
> > @@ -3456,7 +3457,9 @@ static int ath10k_core_probe_fw(struct ath10k *ar)
> >               ath10k_debug_print_board_info(ar);
> >       }
> >
> > -     device_get_mac_address(ar->dev, ar->mac_addr);
> > +     ret = of_get_mac_address(ar->dev->of_node, ar->mac_addr);
> > +     if (ret == -EPROBE_DEFER)
> > +             goto err_free_firmware_files;
>
> Note a similar proposal for ath11k was deferred since it seems to break x86
> attachment when there isn't a device tree node:
> https://msgid.link/ec974dc0-962b-f611-7bbb-c07a3872f70f@oss.qualcomm.com
In response to this, I'll change this patch to only add NVMEM support
>
> I'd have the same concerns here.
> (but I didn't dig into how the fwnode items are set if there isn't a DT)
I have no idea either. I assume for pcie cards the MAC is set from the EEPROM.
>
> >
> >       ret = ath10k_core_init_firmware_features(ar);
> >       if (ret) {
>