linux-kernel - Re: [PATCH net-next v1] net: stmmac: initialize the reset delay array

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Date:   Thu, 20 Jun 2019 19:07:39 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        joabreu@...opsys.com, alexandre.torgue@...com,
        peppe.cavallaro@...com, khilman@...libre.com
Subject: Re: [PATCH net-next v1] net: stmmac: initialize the reset delay array

On Wed, Jun 19, 2019 at 11:41 PM David Miller <davem@...emloft.net> wrote:
>
> From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Date: Tue, 18 Jun 2019 22:39:27 +0200
>
> > Commit ce4ab73ab0c27c ("net: stmmac: drop the reset delays from struct
> > stmmac_mdio_bus_data") moved the reset delay array from struct
> > stmmac_mdio_bus_data to a stack variable.
> > The values from the array inside struct stmmac_mdio_bus_data were
> > previously initialized to 0 because the struct was allocated using
> > devm_kzalloc(). The array on the stack has to be initialized
> > explicitly, else we might be reading garbage values.
> >
> > Initialize all reset delays to 0 to ensure that the values are 0 if the
> > "snps,reset-delays-us" property is not defined.
> > This fixes booting at least two boards (MIPS pistachio marduk and ARM
> > sun8i H2+ Orange Pi Zero). These are hanging during boot when
> > initializing the stmmac Ethernet controller (as found by Kernel CI).
> > Both have in common that they don't define the "snps,reset-delays-us"
> > property.
> >
> > Fixes: ce4ab73ab0c27c ("net: stmmac: drop the reset delays from struct stmmac_mdio_bus_data")
> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>
> Applied, thanks.
thank you!

> > Please feel free to squash this into net-next commit ce4ab73ab0c27c.
>
> We do not "squash" things into existing net-next commits, as commits in
> my tree(s) are permanent and immutable.
understood. other maintainers do it so I thought I would mention it
I'm happy either way


Martin