linux-kernel - Re: USB autosuspend and turning of usb pendrive leds

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Message-Id: <200709241525.51187.oliver@neukum.org>
Date:	Mon, 24 Sep 2007 15:25:50 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Hans de Goede <j.w.r.degoede@....nl>
Cc:	Jiri Kosina <jikos@...os.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: USB autosuspend and turning of usb pendrive leds

Am Montag 24 September 2007 schrieb Hans de Goede:
> Oliver Neukum wrote:
> > Am Freitag 21 September 2007 schrieb Jiri Kosina:
> >> On Fri, 21 Sep 2007, Hans de Goede wrote:
> >>
> >>> Thats not what I had in mind, autosuspend doesn't work (presumably 
> >>> because hal keeps polling for media change) maybe I should fix hal to 
> >>> not keep polling for devices which don't have removable media?
> >> Hi Hans,
> >>
> >> I think the correct solution is that HAL stops polling the device as soon 
> >> as it sees that it got autosuspended.
> > 
> > And how would we notice a medium change then? If there's an alternative
> > way to notice it or we know it cannot happen there's no reason to poll at all.
> > 
> 
> It looks like hal is currently polling device of which it knows the medium is 
> not removable, like USB-pens.

It doesn't, which is the point. The overwhelming number of USB devices
don't bother to correctly declare themselves not removable SCSI devices.
The discrimination will have to happen on a product:vendor basis, which
means that a large database has to be built and maintained.

	Regards
		Oliver
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