linux-kernel - Re: [PATCH 01/11] pmdomain: core: Convert genpd_power

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Message-ID: <aAeZSmRtVyxEzqvC@linaro.org>
Date: Tue, 22 Apr 2025 16:27:38 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Saravana Kannan <saravanak@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
	linux-pm@...r.kernel.org, "Rafael J . Wysocki" <rafael@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Devarsh Thakkar <devarsht@...v0571a.ent.ti.com>,
	Peng Fan <peng.fan@....nxp.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Johan Hovold <johan@...nel.org>,
	Maulik Shah <maulik.shah@....qualcomm.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] pmdomain: core: Convert genpd_power_off() to void

On 25-04-17 16:24:59, Ulf Hansson wrote:
> At some point it made sense to have genpd_power_off() to return an error
> code. That hasn't been the case for quite some time, so let's convert it
> into a static void function and simplify some of the corresponding code.
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
>  drivers/pmdomain/core.c | 26 +++++++++++---------------
>  1 file changed, 11 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
> index 3523d0331cec..574a0de1696a 100644
> --- a/drivers/pmdomain/core.c
> +++ b/drivers/pmdomain/core.c
> @@ -908,13 +908,12 @@ static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
>   * If all of the @genpd's devices have been suspended and all of its subdomains
>   * have been powered down, remove power from @genpd.
>   */
> -static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
> -			   unsigned int depth)
> +static void genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
> +			    unsigned int depth)
>  {
>  	struct pm_domain_data *pdd;
>  	struct gpd_link *link;
>  	unsigned int not_suspended = 0;
> -	int ret;
>  
>  	/*
>  	 * Do not try to power off the domain in the following situations:
> @@ -922,7 +921,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  	 * (2) System suspend is in progress.
>  	 */
>  	if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
> -		return 0;
> +		return;
>  
>  	/*
>  	 * Abort power off for the PM domain in the following situations:
> @@ -932,7 +931,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  	if (genpd_is_always_on(genpd) ||
>  			genpd_is_rpm_always_on(genpd) ||
>  			atomic_read(&genpd->sd_count) > 0)
> -		return -EBUSY;
> +		return;
>  
>  	/*
>  	 * The children must be in their deepest (powered-off) states to allow
> @@ -943,7 +942,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  	list_for_each_entry(link, &genpd->parent_links, parent_node) {
>  		struct generic_pm_domain *child = link->child;
>  		if (child->state_idx < child->state_count - 1)
> -			return -EBUSY;
> +			return;
>  	}
>  
>  	list_for_each_entry(pdd, &genpd->dev_list, list_node) {
> @@ -957,15 +956,15 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  
>  		/* The device may need its PM domain to stay powered on. */
>  		if (to_gpd_data(pdd)->rpm_always_on)
> -			return -EBUSY;
> +			return;
>  	}
>  
>  	if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
> -		return -EBUSY;
> +		return;
>  
>  	if (genpd->gov && genpd->gov->power_down_ok) {
>  		if (!genpd->gov->power_down_ok(&genpd->domain))
> -			return -EAGAIN;
> +			return;
>  	}
>  
>  	/* Default to shallowest state. */
> @@ -974,12 +973,11 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  
>  	/* Don't power off, if a child domain is waiting to power on. */
>  	if (atomic_read(&genpd->sd_count) > 0)
> -		return -EBUSY;
> +		return;
>  
> -	ret = _genpd_power_off(genpd, true);
> -	if (ret) {
> +	if (_genpd_power_off(genpd, true)) {
>  		genpd->states[genpd->state_idx].rejected++;
> -		return ret;
> +		return;
>  	}
>  
>  	genpd->status = GENPD_STATE_OFF;
> @@ -992,8 +990,6 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
>  		genpd_power_off(link->parent, false, depth + 1);
>  		genpd_unlock(link->parent);
>  	}
> -
> -	return 0;
>  }
>  
>  /**
> -- 
> 2.43.0
>