linux-kernel - Re: [PATCH] driver core: auxiliary bus: Drop dev_pm_domain

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Message-ID: <CAPDyKFpUgBSbXuoJejvU7phSxoS6c-W4ZcBmm6JwwzzsDe+x+g@mail.gmail.com>
Date: Wed, 27 Aug 2025 13:35:26 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: gregkh@...uxfoundation.org, david.m.ertman@...el.com, ira.weiny@...el.com, 
	leon@...nel.org, rafael@...nel.org, dakr@...nel.org, 
	linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH] driver core: auxiliary bus: Drop dev_pm_domain_detach() call

On Wed, 27 Aug 2025 at 12:05, Claudiu <claudiu.beznea@...on.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> Starting with commit f99508074e78 ("PM: domains: Detach on
> device_unbind_cleanup()"), there is no longer a need to call
> dev_pm_domain_detach() in the bus remove function. The
> device_unbind_cleanup() function now handles this to avoid
> invoking devres cleanup handlers while the PM domain is
> powered off, which could otherwise lead to failures as
> described in the above-mentioned commit.
>
> Drop the explicit dev_pm_domain_detach() call and rely instead
> on the flags passed to dev_pm_domain_attach() to power off the
> domain.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe


> ---
>  drivers/base/auxiliary.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index 12ffdd843756..f65ba30d0617 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -217,17 +217,14 @@ static int auxiliary_bus_probe(struct device *dev)
>         struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
>         int ret;
>
> -       ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON);
> +       ret = dev_pm_domain_attach(dev, PD_FLAG_ATTACH_POWER_ON |
> +                                       PD_FLAG_DETACH_POWER_OFF);
>         if (ret) {
>                 dev_warn(dev, "Failed to attach to PM Domain : %d\n", ret);
>                 return ret;
>         }
>
> -       ret = auxdrv->probe(auxdev, auxiliary_match_id(auxdrv->id_table, auxdev));
> -       if (ret)
> -               dev_pm_domain_detach(dev, true);
> -
> -       return ret;
> +       return auxdrv->probe(auxdev, auxiliary_match_id(auxdrv->id_table, auxdev));
>  }
>
>  static void auxiliary_bus_remove(struct device *dev)
> @@ -237,7 +234,6 @@ static void auxiliary_bus_remove(struct device *dev)
>
>         if (auxdrv->remove)
>                 auxdrv->remove(auxdev);
> -       dev_pm_domain_detach(dev, true);
>  }
>
>  static void auxiliary_bus_shutdown(struct device *dev)
> --
> 2.43.0
>