linux-kernel - Re: [PATCH 00/10] Regulator ena

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Message-ID: <20181128152238.GV16508@imbe.wolfsonmicro.main>
Date:   Wed, 28 Nov 2018 15:22:38 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 00/10] Regulator ena_gpiod fixups

On Wed, Nov 28, 2018 at 11:43:40AM +0100, Linus Walleij wrote:
>  drivers/gpio/gpiolib.h                 |  6 -----
>  drivers/regulator/da9211-regulator.c   |  4 +--
>  drivers/regulator/fixed.c              |  4 ++-
>  drivers/regulator/lm363x-regulator.c   |  8 ++++--
>  drivers/regulator/lp8788-ldo.c         |  4 ++-
>  drivers/regulator/max77686-regulator.c |  3 +--
>  drivers/regulator/max8952.c            |  8 +++---
>  drivers/regulator/max8973-regulator.c  | 12 ++++++---
>  drivers/regulator/s5m8767.c            | 37 ++++++++++++++++++--------
>  drivers/regulator/tps65090-regulator.c | 10 +++----
>  include/linux/gpio/consumer.h          | 13 +++++++++
>  11 files changed, 72 insertions(+), 37 deletions(-)

It looks like the patches are assuming the regulator core,
doesn't free the GPIO on an error, however that is not true in
all cases. If only a single regulator has requested the GPIO then
all the error paths after the call to regulator_ena_gpio_request
in regulator_register will free the GPIO. Although this is not the
case if more than one regulator has requested the GPIO.

Thanks,
charles