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

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Message-ID: <20150130161555.GA22140@thinkoso.home>
Date:	Fri, 30 Jan 2015 17:15:55 +0100
From:	Olivier Sobrie <olivier@...rie.be>
To:	Dan Williams <dcbw@...hat.com>
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

Hello Dan,

On Fri, Jan 30, 2015 at 09:47:59AM -0600, Dan Williams wrote:
> 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"...
> 

If I set explicitly rfkill_counter = 0, checkpatch triggers an error:

  ERROR: do not initialise statics to 0 or NULL
  #36: FILE: drivers/net/usb/hso.c:2472:
  +	static u32 rfkill_counter = 0;

Olivier
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