[PATCH v19 4/6] misc: eeprom: at24: check suspend status before disable regulator

[Bartosz Golaszewski]

On Wed, Apr 14, 2021 at 7:29 PM Hsin-Yi Wang <hsinyi at chromium.org> wrote:
>
> cd5676db0574 ("misc: eeprom: at24: support pm_runtime control") disables
> regulator in runtime suspend. If runtime suspend is called before
> regulator disable, it will results in regulator unbalanced disabling.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi at chromium.org>

Please add the Fixes tag.

> ---
>  drivers/misc/eeprom/at24.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
> index 926408b41270..7a6f01ace78a 100644
> --- a/drivers/misc/eeprom/at24.c
> +++ b/drivers/misc/eeprom/at24.c
> @@ -763,7 +763,8 @@ static int at24_probe(struct i2c_client *client)
>         at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
>         if (IS_ERR(at24->nvmem)) {
>                 pm_runtime_disable(dev);
> -               regulator_disable(at24->vcc_reg);
> +               if (!pm_runtime_status_suspended(dev))
> +                       regulator_disable(at24->vcc_reg);
>                 return PTR_ERR(at24->nvmem);
>         }
>
> @@ -774,7 +775,8 @@ static int at24_probe(struct i2c_client *client)
>         err = at24_read(at24, 0, &test_byte, 1);
>         if (err) {
>                 pm_runtime_disable(dev);
> -               regulator_disable(at24->vcc_reg);
> +               if (!pm_runtime_status_suspended(dev))
> +                       regulator_disable(at24->vcc_reg);
>                 return -ENODEV;
>         }
>
> --
> 2.31.1.295.g9ea45b61b8-goog
>

Acked-by: Bartosz Golaszewski <bgolaszewski at baylibre.com>