Regression, bisected: meson-dwmac8b never loads, no ethernet

[Arnd Bergmann]

On Tue, Sep 21, 2021 at 1:43 AM Geraldo Nascimento
<geraldogabriel at gmail.com> wrote:
>
> Hello Arnd,
>
> I'm sorry to inform you that commit
> a0f480dc6546b9d97027bf7bc8145aad48ddad00 causes a regression in
> 5.15-rc1 for the meson-dwmac8b ethernet driver.
>
> meson-dwmac8b never loads and libphy never probes stmmac
>
> I've bisected it over the weekend. The results follow.
>
> The bad commit mostly consists of qcom DT changes that shouldn't
> trigger anything nasty like missing ethernet for meson (amlogic) but
> there's the possibility the regression is caused by stmmac
> modifications inside "Merge tag 'v5.14-rc3' into arm64-for-5.15
> (2021-08-16 18:02:26 -0500)"
>
> This is just a guess as I haven't been able to pinpoint so far what
> precisely causes the regression.

I'm sure it's not this commit, looking at the contents of the tree
before and after,
it does not touch a single file that is used on your machine.

Sometimes bisections are unreliable. I would suggest you re-test commit
 a0f480dc6546b9 and the one before it, one of them will likely show a different
result from what you had. You can then replay your bisection to find
the actual cause.

       Arnd