linux-kernel - Re: [PATCH 2/2] ARM: cpuidle: replace cpuidle_get_driver with cpuidle_get_cpu

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Message-ID: <20171007121247.GB23080@leoy-linaro>
Date:   Sat, 7 Oct 2017 20:12:47 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH 2/2] ARM: cpuidle: replace cpuidle_get_driver with
 cpuidle_get_cpu_driver

On Mon, Sep 04, 2017 at 02:52:14PM +0800, Leo Yan wrote:
> commit d50a7d8acd78 ("ARM: cpuidle: Support asymmetric idle definition")
> supports multiple CPU idle driver so every CPU has its own driver. When
> the initialization fails, the failure handling releases the resources
> for every previous CPU; so it needs to retrieve every CPU device and
> driver handler and unregister them. But the function
> cpuidle_get_driver() can only return current CPU driver handler but not
> the iterated CPU driver handler, so it cannot release resource properly.
> 
> This patch is to replace cpuidle_get_driver() with
> cpuidle_get_cpu_driver(), every CPU has its own device handler so this
> function can get back correct driver handler for the CPU according to
> the CPU device handler. By using this CPU driver handler we can release
> resource properly.
> 
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Stefan Wahren <stefan.wahren@...e.com>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> Fixes: d50a7d8acd78 ("ARM: cpuidle: Support asymmetric idle definition")

Gentle ping.

> ---
>  drivers/cpuidle/cpuidle-arm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
> index f419f6a..ef34780 100644
> --- a/drivers/cpuidle/cpuidle-arm.c
> +++ b/drivers/cpuidle/cpuidle-arm.c
> @@ -161,9 +161,9 @@ static int __init arm_idle_init(void)
>  
>  	while (--cpu >= 0) {
>  		dev = per_cpu(cpuidle_devices, cpu);
> +		drv = cpuidle_get_cpu_driver(dev);
>  		cpuidle_unregister_device(dev);
>  		kfree(dev);
> -		drv = cpuidle_get_driver();
>  		cpuidle_unregister_driver(drv);
>  		kfree(drv);
>  	}
> -- 
> 2.7.4
>