linux-kernel - Re: [PATCH 1/2] ARM: cpuidle: fix !cpuidle

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Date:	Fri, 25 Mar 2016 12:46:10 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Jisheng Zhang <jszhang@...vell.com>, linux@....linux.org.uk
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: cpuidle: fix !cpuidle_ops[cpu].init case during
 init

On 03/24/2016 06:11 AM, Jisheng Zhang wrote:
> Let's assume cpuidle_ops exists but it doesn't implement the according
> init member, current arm_cpuidle_init() will return success to its
> caller, but in fact it should return -EOPNOTSUPP.
>
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> ---
>   arch/arm/kernel/cpuidle.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
> index 703926e..f108d8f 100644
> --- a/arch/arm/kernel/cpuidle.c
> +++ b/arch/arm/kernel/cpuidle.c
> @@ -143,8 +143,12 @@ int __init arm_cpuidle_init(int cpu)
>   		return -ENODEV;
>
>   	ret = arm_cpuidle_read_ops(cpu_node, cpu);
> -	if (!ret && cpuidle_ops[cpu].init)
> -		ret = cpuidle_ops[cpu].init(cpu_node, cpu);
> +	if (!ret) {
> +		if (cpuidle_ops[cpu].init)
> +			ret = cpuidle_ops[cpu].init(cpu_node, cpu);
> +		else
> +			ret = -EOPNOTSUPP;
> +	}

Hi Jisheng,

this should be handled in the arm_cpuidle_read_ops function.

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