linux-kernel - Re: [PATCH v2 11/11] hso: fix rfkill name conflicts

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Date:	Fri, 30 Jan 2015 09:47:59 -0600
From:	Dan Williams <dcbw@...hat.com>
To:	Olivier Sobrie <olivier@...rie.be>
Cc:	Jan Dumon <j.dumon@...ion.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 11/11] hso: fix rfkill name conflicts

On Fri, 2015-01-30 at 13:22 +0100, Olivier Sobrie wrote:
> By using only the usb interface number for the rfkill name, we might
> have a name conflicts in case two similar hso devices are connected.
> 
> In this patch, the name of the hso rfkill interface embed the value
> of a counter that is incremented each time a new rfkill interface is
> added.
> 
> Suggested-by: Dan Williams <dcbw@...hat.com>
> Signed-off-by: Olivier Sobrie <olivier@...rie.be>
> ---
>  drivers/net/usb/hso.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index c14fc80..d31a165 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -153,7 +153,7 @@ struct hso_net {
>  	struct hso_device *parent;
>  	struct net_device *net;
>  	struct rfkill *rfkill;
> -	char name[8];
> +	char name[24];
>  
>  	struct usb_endpoint_descriptor *in_endp;
>  	struct usb_endpoint_descriptor *out_endp;
> @@ -2469,9 +2469,10 @@ static void hso_create_rfkill(struct hso_device *hso_dev,
>  {
>  	struct hso_net *hso_net = dev2net(hso_dev);
>  	struct device *dev = &hso_net->net->dev;
> +	static u32 rfkill_counter;

It'll probably be initialized to 0, but still, it would feel safer with
an explicit "rfkill_counter = 0"...

Dan
 
>  	snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
> -		 interface->altsetting->desc.bInterfaceNumber);
> +		 rfkill_counter++);
>  
>  	hso_net->rfkill = rfkill_alloc(hso_net->name,
>  				       &interface_to_usbdev(interface)->dev,


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