linux-kernel - Re: [PATCH 3/3] PM / Domains: Enable genpd_dev_pm_attach_by

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Date:   Wed, 24 Apr 2019 13:28:53 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] PM / Domains: Enable
 genpd_dev_pm_attach_by_id|name() for single PM domain

On Thu, Apr 18, 2019 at 12:27:57PM +0200, Ulf Hansson wrote:
> If a call to dev_pm_domain_attach() succeeds to attach a device to its
> single PM domain, the important point is to prevent following calls to

nit: s/prevent/ensure/

> dev_pm_domain_attach_by_name|id() to fail. This is managed by checking the
> dev->pm_domain pointer and then return -EEXIST, rather than continue
> calling genpd_dev_pm_attach_by_id|name().
> 
> For this reason, let's enable genpd_dev_pm_attach_by_id|name() to be used
> for also single PM domains. This simplifies for future users to solely make
> use of dev_pm_domain_attach_by_id|name() rather than having to combine it
> with dev_pm_domain_attach().
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>  drivers/base/power/domain.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 801f31c87d16..1b026704a8fc 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2512,10 +2512,10 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
>  	if (!dev->of_node)
>  		return NULL;
>  
> -	/* Deal only with devices using multiple PM domains. */
> +	/* Verify that the index is within a valid range. */
>  	num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
>  						 "#power-domain-cells");
> -	if (num_domains < 2 || index >= num_domains)
> +	if (index >= num_domains)
>  		return NULL;
>  
>  	/* Allocate and register device on the genpd bus. */
> -- 
> 2.17.1
> 

Acked-by: Niklas Cassel <niklas.cassel@...aro.org>