linux-kernel - Re: [PATCH 1/4] PM / Domains: Use the base device for driver_deferred_probe_check

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Message-ID: <20190425093956.upvslvsxobtv2w3y@vireshk-i7>
Date:   Thu, 25 Apr 2019 15:09:56 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Raju P . L . S . S . S . N" <rplsssn@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 1/4] PM / Domains: Use the base device for
 driver_deferred_probe_check_state()

On 25-04-19, 11:04, Ulf Hansson wrote:
> When genpd fails to attach a device to one of its multiple PM domains, we
> end up calling driver_deferred_probe_check_state() for the recently
> allocated virtual device. This is wrong, as it's the base device that is
> being probed. Fix this, by passing along the base device to
> __genpd_dev_pm_attach() and use that instead.
> 
> Fixes: e01afc325025 ("PM / Domains: Stop deferring probe at the end of initcall")
> Cc: Rob Herring <robh@...nel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>  drivers/base/power/domain.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 8362dfe187f5..8aca1c9b4406 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2405,8 +2405,8 @@ static void genpd_dev_pm_sync(struct device *dev)
>  	genpd_queue_power_off_work(pd);
>  }
>  
> -static int __genpd_dev_pm_attach(struct device *dev, unsigned int index,
> -				 bool power_on)
> +static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
> +				 unsigned int index, bool power_on)
>  {
>  	struct of_phandle_args pd_args;
>  	struct generic_pm_domain *pd;
> @@ -2424,7 +2424,7 @@ static int __genpd_dev_pm_attach(struct device *dev, unsigned int index,
>  		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(dev);
> +		return driver_deferred_probe_check_state(base_dev);
>  	}
>  
>  	dev_dbg(dev, "adding to PM domain %s\n", pd->name);
> @@ -2480,7 +2480,7 @@ int genpd_dev_pm_attach(struct device *dev)
>  				       "#power-domain-cells") != 1)
>  		return 0;
>  
> -	return __genpd_dev_pm_attach(dev, 0, true);
> +	return __genpd_dev_pm_attach(dev, dev, 0, true);
>  }
>  EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
>  
> @@ -2533,7 +2533,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
>  	}
>  
>  	/* Try to attach the device to the PM domain at the specified index. */
> -	ret = __genpd_dev_pm_attach(virt_dev, index, false);
> +	ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
>  	if (ret < 1) {
>  		device_unregister(virt_dev);
>  		return ret ? ERR_PTR(ret) : NULL;

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh