linux-kernel - Re: [PATCH] PM: domains: Move the verification of in-params from genpd_add

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Date:   Fri, 16 Jun 2023 19:40:45 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        Kevin Hilman <khilman@...nel.org>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM: domains: Move the verification of in-params from genpd_add_device()

On Tue, May 30, 2023 at 11:55 AM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> The commit f38d1a6d0025 ("PM: domains: Allocate governor data dynamically
> based on a genpd governor") started to use the in-parameters in
> genpd_add_device(), without first doing a verification of them.
>
> This isn't really a big problem, as most callers do a verification already.
> Therefore, let's drop the verification from genpd_add_device() and make
> sure all the callers take care of it instead.
>
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Fixes: f38d1a6d0025 ("PM: domains: Allocate governor data dynamically based on a genpd governor")
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>  drivers/base/power/domain.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 51b9d4eaab5e..5cb2023581d4 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -1632,9 +1632,6 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
>
>         dev_dbg(dev, "%s()\n", __func__);
>
> -       if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
> -               return -EINVAL;
> -
>         gpd_data = genpd_alloc_dev_data(dev, gd);
>         if (IS_ERR(gpd_data))
>                 return PTR_ERR(gpd_data);
> @@ -1676,6 +1673,9 @@ int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
>  {
>         int ret;
>
> +       if (!genpd || !dev)
> +               return -EINVAL;
> +
>         mutex_lock(&gpd_list_lock);
>         ret = genpd_add_device(genpd, dev, dev);
>         mutex_unlock(&gpd_list_lock);
> @@ -2523,6 +2523,9 @@ int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
>         struct generic_pm_domain *genpd;
>         int ret;
>
> +       if (!dev)
> +               return -EINVAL;
> +
>         mutex_lock(&gpd_list_lock);
>
>         genpd = genpd_get_from_provider(genpdspec);
> --

Applied as 6.5 material, thanks!