netdev - Re: [PATCH] of_mdio: fix phy interrupt passing

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Date:	Tue, 18 Feb 2014 09:30:24 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:	linux-kernel@...ts.codethink.co.uk, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-sh@...r.kernel.org, sergei.shtylyov@...entembedded.com,
	Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: Re: [PATCH] of_mdio: fix phy interrupt passing

On Mon, 17 Feb 2014 16:29:40 +0000, Ben Dooks <ben.dooks@...ethink.co.uk> wrote:
> The of_mdiobus_register_phy() is not setting phy->irq this causing
> some drivers to incorrectly assume that the PHY does not have an
> IRQ associated with it or install an interrupt handler for the
> PHY.
> 
> Simplify the code setting irq and set the phy->irq at the same
> time so that the case if mdio->irq is not NULL is easier to read.
> 
> This fixes the issue:
>  net eth0: attached PHY 1 (IRQ -1) to driver Micrel KSZ8041RNLI
> 
> to the correct:
>  net eth0: attached PHY 1 (IRQ 416) to driver Micrel KSZ8041RNLI
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> ---
>  drivers/of/of_mdio.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index 875b7b6..7b3e7b0 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -44,7 +44,7 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
>  {
>  	struct phy_device *phy;
>  	bool is_c45;
> -	int rc, prev_irq;
> +	int rc;
>  	u32 max_speed = 0;
>  
>  	is_c45 = of_device_is_compatible(child,
> @@ -55,11 +55,11 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
>  		return 1;
>  
>  	if (mdio->irq) {
> -		prev_irq = mdio->irq[addr];
> -		mdio->irq[addr] =
> -			irq_of_parse_and_map(child, 0);
> -		if (!mdio->irq[addr])
> -			mdio->irq[addr] = prev_irq;

I cannot for the life for me remeber why the code was structured that
way. Your change is better.

> +		rc = irq_of_parse_and_map(child, 0);
> +		if (rc > 0) {
> +			mdio->irq[addr] = rc;
> +			phy->irq = rc;
> +		}
>  	}

The outer if is merely protecting against no irq array being allocated
for the bus. Would not the following be better:

	rc = irq_of_parse_and_map(child, 0);
	if (rc > 0) {
		phy->irq = rc;
		if (mdio->irq)
			mdio->irq[addr] = rc;
	}

g.
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