linux-kernel - Re: [PATCH RESEND 0/4] regulator: debugging and fixing supply deps

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Message-ID: <0cb181b3-d257-b7a4-56e4-0d2bb04b0387@pengutronix.de>
Date:   Fri, 13 Nov 2020 12:19:24 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH RESEND 0/4] regulator: debugging and fixing supply deps

Hello Michał,

On 11/13/20 1:20 AM, Michał Mirosław wrote:
> It turns out that commit aea6cb99703e ("regulator: resolve supply
> after creating regulator") exposed a number of issues in regulator
> initialization and introduced a memory leak of its own. One uncovered
> problem was already fixed by cf1ad559a20d ("regulator: defer probe when
> trying to get voltage from unresolved supply"). This series fixes the
> remaining ones and adds a two debugging aids to help in the future.
> 
> The final patch adds a workaround to preexisting problem occurring with
> regulators that have the same name as its supply_name. This worked
> before by accident, so might be worth backporting. The error message is
> left on purpose so that these configurations can be detected and fixed.
> 
> (The first two patches are resends from Nov 5).
> 
> (Series resent because of wrong arm-kernel ML address.)

lxa-mc1 (STM32MP1 board with STPMIC) now manages to boot again with following
new warning:

  stpmic1-regulator 5c002000.i2c:stpmic@33:regulators: Supply for VREF_DDR

So for the whole series,
Tested-by: Ahmad Fatoum <a.fatoum@...gutronix.de> # stpmic1

Thanks!
Ahmad

> 
> Michał Mirosław (4):
>   regulator: fix memory leak with repeated set_machine_constraints()
>   regulator: debug early supply resolving
>   regulator: avoid resolve_supply() infinite recursion
>   regulator: workaround self-referent regulators
> 
>  drivers/regulator/core.c | 40 ++++++++++++++++++++++++----------------
>  1 file changed, 24 insertions(+), 16 deletions(-)
> 

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