linux-kernel - Re: [PATCH] net: mdio-gpio: Allow for unspecified bus id

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Date:	Fri, 8 May 2015 17:48:16 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Bert Vermeulen <bert@...t.com>
Cc:	f.fainelli@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mdio-gpio: Allow for unspecified bus id

On Fri, May 08, 2015 at 04:18:49PM +0200, Bert Vermeulen wrote:
> When the bus id was supplied via a struct platform_device, the driver wasn't
> handling -1 to mean an unspecified id of the only instance of this driver,
> as the platform spec requires.
> 
> Signed-off-by: Bert Vermeulen <bert@...t.com>
> ---
>  drivers/net/phy/mdio-gpio.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
> index f5cddf5..7bd90db 100644
> --- a/drivers/net/phy/mdio-gpio.c
> +++ b/drivers/net/phy/mdio-gpio.c
> @@ -165,7 +165,10 @@ static struct mii_bus *mdio_gpio_bus_init(struct device *dev,
>  		if (!new_bus->irq[i])
>  			new_bus->irq[i] = PHY_POLL;
>  
> -	snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
> +	if (bus_id != -1)
> +		snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
> +	else
> +		strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);

Hi Bert

What happens if there are multiple platform_device's with -1?  You
should probably be using use idr_alloc().

    Andrew
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