linux-kernel - Re: [PATCH] move eject code from zd1211rw to usb-storage

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Date:	Wed, 16 Dec 2009 11:50:48 -0800
From:	Dan Williams <dcbw@...hat.com>
To:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Josua Dietze <digidietze@...isberghof.de>,
	Stefan Seyfried <stefan.seyfried@...glemail.com>,
	linux-usb@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
	Stefan Seyfried <seife@...airon.com>
Subject: Re: [PATCH] move eject code from zd1211rw to usb-storage

On Wed, 2009-12-16 at 10:03 -0800, Matthew Dharm wrote:
> On Wed, Dec 16, 2009 at 11:29:27AM +0100, Oliver Neukum wrote:
> > Am Dienstag, 15. Dezember 2009 19:03:00 schrieb Matthew Dharm:
> > > > This would break existing systems and thus introduce a regression.
> > > > We'd need to go through a feature removal process. For the time being
> > > > I see no alternative to Seife's patch, as we cannot introduce ejection
> > > > code to another wireless driver and need to support these devices.
> > > 
> > > The right answer here is neither to move the eject code nor to introduce
> > > more of it.  New devices should be supported via userspace.
> > 
> > Usually I would agree, but in this case the vendor reused IDs.
> > The legacy kernel space switcher and user space would race.
> 
> So, let me see if I understand this... we have two devices that use the
> same IDs, and get mode-switched the same way, but need different
> post-switch drivers?
> 
> If this is the case, then the only reasonable answer to is to push the
> modeswitch code for both into udev and out of the kernel.  It will take

you mean usb_modeswitch, not udev actually.

> longer to support the new device that way (since we need to wait until udev
> is updated and then remove kernel support), but that's what a vendor gets
> for re-using IDs.
> 
> Matt
> 

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