linux-kernel - Re: USB deadlock after resume

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Date:	Wed, 21 Nov 2007 16:10:58 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Felipe Balbi <me@...ipebalbi.com>
Cc:	Markus Rechberger <mrechberger@...il.com>, Mark Lord <lkml@....ca>,
	linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net,
	Laurent Pinchart <laurentp@...-semaphore.com>
Subject: Re: USB deadlock after resume

Am Mittwoch 21 November 2007 schrieb Felipe Balbi:
> > Do you know any good way for performing a softreset within the driver?
> > The video application should get a continuous datastream after
> > resuming the notebook, so the driver shouldn't be unloaded.
> > The driver also keeps a list of previous camera settings which should
> > be set up again after resuming. Stopping the video application and
> > reattaching the device using ACPI (this board supports reconnecting
> > the device using ACPI) should be avoided.
> 
> When you suspend, you cut off vbus (afaik, correct me if I'm wrong), which
> means your device will get disconnected. One way to avoid this is enabling
> CONFIG_USB_PERSIST and trying with that on.

Suspend may or may not cut off power. If it does cut off power, resume() will
never be called, instead either disconnect() or reset_resume().

	Regards
		Oliver

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