netdev - RE: [PATCH net-next 3/3] ptp: derive the device name from the parent device

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Date:	Fri, 21 Sep 2012 18:40:58 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Keller, Jacob E" <jacob.e.keller@...el.com>
CC:	Richard Cochran <richardcochran@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	"Vick, Matthew" <matthew.vick@...el.com>
Subject: RE: [PATCH net-next 3/3] ptp: derive the device name from the
 parent device

On Fri, 2012-09-21 at 17:39 +0000, Keller, Jacob E wrote:
> > -----Original Message-----
> > From: Richard Cochran [mailto:richardcochran@...il.com]
> > Sent: Friday, September 21, 2012 10:37 AM
> > To: Ben Hutchings
> > Cc: netdev@...r.kernel.org; David Miller; Keller, Jacob E; Kirsher,
> > Jeffrey T; John Stultz; Vick, Matthew
> > Subject: Re: [PATCH net-next 3/3] ptp: derive the device name from the
> > parent device
> > 
> > On Fri, Sep 21, 2012 at 06:19:25PM +0100, Ben Hutchings wrote:
> > > On Fri, 2012-09-21 at 19:00 +0200, Richard Cochran wrote:
> > > > PTP Hardware Clock device have a name that appears under sysfs that
> > > > should identify the underlying device. Instead of leaving it up to
> > > > the driver to invent a name, this patch changes the registration to
> > > > automatically use the name from the parent device.
> > >
> > > I thought you wanted the driver name and not the parent device name?
> > 
> > Yes, I originally wanted the driver name, because it gives the user
> > information about the expected performance. But here I am bowing to
> > Jacob's suggestion that we really need to identify the device. Intel cards
> > with two ports have *two* clocks. Sad but true.
> > 
> 
> With the device, it is possible to lookup the driver.

For PCI devices, yes.  But there is really no guarantee that device
names (as in dev_name()) are globally unique either.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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