linux-kernel - Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check

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Message-ID: <CAPDyKFpZTmt71LgQ9vNE4_iRff-OBkDWkHrc7y9zQ7o_Z_UYFA@mail.gmail.com>
Date:   Thu, 9 Jun 2022 13:44:59 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state()

On Wed, 1 Jun 2022 at 09:07, Saravana Kannan <saravanak@...gle.com> wrote:
>
> Now that fw_devlink=on by default and fw_devlink supports
> "power-domains" property, the execution will never get to the point
> where driver_deferred_probe_check_state() is called before the supplier
> has probed successfully or before deferred probe timeout has expired.
>
> So, delete the call and replace it with -ENODEV.

With fw_devlink=on by default - does that mean that the parameter
can't be changed?

Or perhaps the point is that we don't want to go back, but rather drop
the fw_devlink parameter altogether when moving forward?

>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

Just a minor nitpick below. Nevertheless, feel free to add:

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

> ---
>  drivers/base/power/domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 739e52cd4aba..3e86772d5fac 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2730,7 +2730,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
>                 mutex_unlock(&gpd_list_lock);
>                 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
>                         __func__, PTR_ERR(pd));
> -               return driver_deferred_probe_check_state(base_dev);

Adding a brief comment about why -EPROBE_DEFER doesn't make sense
here, would be nice.

> +               return -ENODEV;
>         }
>
>         dev_dbg(dev, "adding to PM domain %s\n", pd->name);
> --
> 2.36.1.255.ge46751e96f-goog
>

Kind regards
Uffe