netdev - Re: [PATCH v2 for v3.15] net: mvmdio: Check for a valid interrupt instead of an error

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Date:	Wed, 30 Apr 2014 21:40:57 +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>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 for v3.15] net: mvmdio: Check for a valid interrupt
 instead of an error

On 04/30/2014 06:28 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 EINVAL and EPROBE_DEFER,
> in addition to ENXIO. If there's no interrupt for mvmdio, platform_get_irq()
> returns EINVAL, 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.
> 
> While at it, add a proper handling for the deferral probe case.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>

Reviewed-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>

Thanks!

> ---
> Changes from v1: Handle the deferral probe as well.
> 
>  drivers/net/ethernet/marvell/mvmdio.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
> index b161a52..9d5ced2 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) {
>  		ret = devm_request_irq(&pdev->dev, dev->err_interrupt,
>  					orion_mdio_err_irq,
>  					IRQF_SHARED, pdev->name, dev);
> @@ -241,6 +241,9 @@ static int orion_mdio_probe(struct platform_device *pdev)
>  
>  		writel(MVMDIO_ERR_INT_SMI_DONE,
>  			dev->regs + MVMDIO_ERR_INT_MASK);
> +
> +	} else if (dev->err_interrupt == -EPROBE_DEFER) {
> +		return -EPROBE_DEFER;
>  	}
>  
>  	mutex_init(&dev->lock);
> 

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