linux-kernel - Re: [PATCH v2] platform: don't return 0 from platform_get_irq[

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Message-ID: <f92c8a76-a042-2af8-6e6b-24f93ed6ae52@cogentembedded.com>
Date:	Mon, 25 Jul 2016 14:55:37 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform: don't return 0 from
 platform_get_irq[_byname]() on error

Hello.

On 7/4/2016 1:04 AM, Sergei Shtylyov wrote:

> of_irq_get[_byname]() return 0 iff  irq_create_of_mapping() call fails.
> Returning both  error code and 0 on failure is a sign of a misdesigned API,
> it makes the failure check unnecessarily complex and error prone. We should
> rely  on the platform IRQ resource in this case, not return 0,  especially
> as 0 can be  a valid  IRQ resource too...
>
> Fixes: aff008ad813c ("platform_get_irq: Revert to platform_get_resource if of_irq_get fails")
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> CC: stable@...r.kernel.org

    4.7 has been tagged now. Can I count on this patch getting to 4.8? Or at 
least some feedback given? :-/

> ---
> The patch is against the 'driver-core-linus' branch of Greg KH's
> 'driver-core.git' repo.
>
> See also commit 3993546646ba ("of: irq: fix of_irq_get[_byname]() kernel-doc")
>
> Changes in version 2:
> - expanded the changelog.
>
>  drivers/base/platform.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> Index: driver-core/drivers/base/platform.c
> ===================================================================
> --- driver-core.orig/drivers/base/platform.c
> +++ driver-core/drivers/base/platform.c
> @@ -97,7 +97,7 @@ int platform_get_irq(struct platform_dev
>  		int ret;
>
>  		ret = of_irq_get(dev->dev.of_node, num);
> -		if (ret >= 0 || ret == -EPROBE_DEFER)
> +		if (ret > 0 || ret == -EPROBE_DEFER)
>  			return ret;
>  	}
>
> @@ -175,7 +175,7 @@ int platform_get_irq_byname(struct platf
>  		int ret;
>
>  		ret = of_irq_get_byname(dev->dev.of_node, name);
> -		if (ret >= 0 || ret == -EPROBE_DEFER)
> +		if (ret > 0 || ret == -EPROBE_DEFER)
>  			return ret;
>  	}
>

MBR, Sergei