linux-kernel - Re: [PATCH] extcon: max14577: Properly handle regmap_irq_get

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Message-id: <5354E943.1070902@samsung.com>
Date:	Mon, 21 Apr 2014 18:47:47 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] extcon: max14577: Properly handle regmap_irq_get_virq error

On 04/18/2014 11:47 PM, Krzysztof Kozlowski wrote:
> The regmap_irq_get_virq may return 0 or -EINVAL on error. Fail the probe
> in both situations.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Cc: <stable@...r.kernel.org>
> ---
>  drivers/extcon/extcon-max14577.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c
> index 3846941801b8..d58747d2ddfa 100644
> --- a/drivers/extcon/extcon-max14577.c
> +++ b/drivers/extcon/extcon-max14577.c
> @@ -650,7 +650,7 @@ static int max14577_muic_probe(struct platform_device *pdev)
>  		unsigned int virq = 0;
>  
>  		virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
> -		if (!virq)
> +		if (virq <= 0)
>  			return -EINVAL;
>  		muic_irq->virq = virq;

Applied it.

But,
IMO, Generally, if function completed the operation without problem,
return zero(0). But, irq_create_mapping() returns zero(0) when error happen.
It is necessary to modify irq_create_mapping(kernel/irq/irqdomain.c) about return value.

Thanks,
Chanwoo Choi

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