linux-kernel - Re: driver model, duplicate names question

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Message-ID: <20130716183149.GA6164@kroah.com>
Date:	Tue, 16 Jul 2013 11:31:49 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: driver model, duplicate names question

On Tue, Jul 16, 2013 at 11:29:42AM -0700, Srinivas Pandruvada wrote:
> Thanks for the quick response. Here I am creating virtual devices using 
> device_register.
> I have attached a simple test program, which will give error.
> 
> This is my intention:
> 
> $> cd /sys/class/test_class
> $> ls
> power_zone_cpu_package_0
> power_zone_cpu_package_1

Wait, you are mixing a class and a "real" bus up.  This will fail as
your devices all end up on the virtual "bus" with the same name, in the
same location on the bus (look in /sys/devices/virtual/ for where they
will end up at.

That will fail, and rightly so.

Try using this with the proper 'struct bus_type' and let me know if
creating a device there with the same name will also fail.

Oh crud, it will, because we can't create symlinks with the same bus
type in the /sys/bus/BUSTYPE/devices/ directory.

So, don't use the same name for a device on the same bus, that way
causes confusion :)

Let's get back to your original "problem", what again are you trying to
solve?  There should be a way to resolve this without having to deal
with duplicate names, perhaps you just want an attribute group with a
common name?

thanks,

greg k-h
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