linux-kernel - Re: [PATCHv5 2/4] usb: gadget: replace "is_dualspeed" with "max

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Date:	Thu, 6 Oct 2011 12:27:10 +0300
From:	Felipe Balbi <balbi@...com>
To:	Michal Nazarewicz <mnazarewicz@...gle.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <balbi@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Yang Rui Rui <ruirui.r.yang@...to.com>,
	Dave Young <hidave.darkstar@...il.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 2/4] usb: gadget: replace "is_dualspeed" with
 "max_speed"

On Fri, Sep 09, 2011 at 04:14:21PM +0200, Michal Nazarewicz wrote:
> On Fri, 26 Aug 2011 15:18:35 +0200, Michal Nazarewicz
> <mnazarewicz@...gle.com> wrote:
> >This commit replaces usb_gadget's is_dualspeed field with
> >a max_speed field.
> >---
> >
> >I was unable to figure out how to create a symlink in
> >non-race-condition way so for now I've created both speed and
> >current_speed attributes.  This needs to get fixed before getting
> >merged.
> >
> >I would even consider just removing speed since udc-core got merged
> >only in 3.1, so maybe it won't be such a big issue?
> 
> I've dug a bit deeper and could not find *any* way of creating the
> speed -> current_speed symlink.  sysfs_create_link() requires target
> to be an kobject and as far as I can see attributes don't have one.
> 
> So I see the following possibilities:
> 
> 1. Leave speed only (as Felipe noticed, this may be confusing for
>    users since there will be "speed" and "maximum_speed").
> 2. Rename it to current_speed without transition period (udc-core is
>    young so maybe no one will notice, but that won't be very nice).

let's use current_speed without the grace period.

-- 
balbi

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