netdev - Re: [PATCH for v3.15] net: mvmdio: Check for a valid interrupt instead of an error

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Date:	Tue, 29 Apr 2014 23:37:26 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	netdev@...r.kernel.org
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH for v3.15] net: mvmdio: Check for a valid interrupt instead
 of an error

On 04/29/2014 09:49 PM, Ezequiel Garcia wrote:
> The following commit:
> 
> commit 9ec36cafe43bf835f8f29273597a5b0cbc8267ef
> Author: Rob Herring <robh@...nel.org>
> Date:   Wed Apr 23 17:57:41 2014 -0500
> 
>     of/irq: do irq resolution in platform_get_irq
> 
> changed platform_get_irq() which now returns ENODEV and EPROBE_DEFER,
> in addition to ENXIO. If there's no interrupt for mvmdio, platform_get_irq()
> returns ENODEV, but we currently check only for ENXIO.
> 
> Fix this by looking for a positive integer, which is the proper way of
> validating a virtual interrupt number.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
> ---
>  drivers/net/ethernet/marvell/mvmdio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
> index b161a52..eb2cabf 100644
> --- a/drivers/net/ethernet/marvell/mvmdio.c
> +++ b/drivers/net/ethernet/marvell/mvmdio.c
> @@ -232,7 +232,7 @@ static int orion_mdio_probe(struct platform_device *pdev)
>  		clk_prepare_enable(dev->clk);
>  
>  	dev->err_interrupt = platform_get_irq(pdev, 0);
> -	if (dev->err_interrupt != -ENXIO) {
> +	if (dev->err_interrupt > 0) {

Ezequiel,

I cannot find where Rob's mentioned patch set adds -ENODEV, but isn't
the semantic for -EPROBE_DEFER: there *should* be an irq, but it is
not yet available. That basically means, we should also defer on that
error otherwise we would ignore that we have actually been given an irq
to work with, right?

Sebastian

>  		ret = devm_request_irq(&pdev->dev, dev->err_interrupt,
>  					orion_mdio_err_irq,
>  					IRQF_SHARED, pdev->name, dev);
> 

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