linux-kernel - Re: USB mini-summit at LinuxCon Vancouver

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Date:	Thu, 4 Aug 2011 15:56:03 -0700
From:	Greg KH <greg@...ah.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, libusb-devel@...ts.sourceforge.net,
	Alexander Graf <agraf@...e.de>,
	Gerd Hoffmann <kraxel@...hat.com>, hector@...cansoft.com,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	pbonzini@...hat.com, Anthony Liguori <aliguori@...ibm.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>, Felipe Balbi <balbi@...com>,
	Clemens Ladisch <clemens@...isch.de>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Theodore Kilgore <kilgota@...ach.math.auburn.edu>,
	Adam Baker <linux@...er-net.org.uk>
Subject: Re: USB mini-summit at LinuxCon Vancouver

On Thu, Aug 04, 2011 at 07:21:47PM -0300, Mauro Carvalho Chehab wrote:
> I know that this problem were somewhat solved for 3G modems, with the usage
> of the userspace problem usb_modeswitch, and with some quirks for the USB
> storage driver, but I'm not sure if such tricks will scale forever, as more
> functions are seen on some USB devices.

Well, no matter how it "scales" it needs to be done in userspace, like
usb_modeswitch does.  We made that decision a while ago, and it is
working out very well.  I see no reason why you can't do it in userspace
as well as that is the easiest place to control this type of thing.

I thought we had a long discussion about this topic a while ago and came
to this very conclusion.  Or am I mistaken?

thanks,

greg k-h
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