linux-kernel - Re: USB deadlock after resume

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Date:	Wed, 21 Nov 2007 09:00:54 -0600
From:	Felipe Balbi <me@...ipebalbi.com>
To:	Markus Rechberger <mrechberger@...il.com>
Cc:	Oliver Neukum <oliver@...kum.org>, 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



On Wed, 21 Nov 2007 15:52:37 +0100, "Markus Rechberger"
<mrechberger@...il.com> wrote:
> On 11/21/07, Markus Rechberger <mrechberger@...il.com> wrote:
>> On 11/21/07, Markus Rechberger <mrechberger@...il.com> wrote:
>> > On 11/21/07, Oliver Neukum <oliver@...kum.org> wrote:
>> > > Am Mittwoch 21 November 2007 schrieb Markus Rechberger:
>> > > > On 11/21/07, Markus Rechberger <mrechberger@...il.com> wrote:
>> > > > > On 11/21/07, Mark Lord <lkml@....ca> wrote:
>> > > > > > Markus Rechberger wrote:
>> > > > > > > Hi,
>> > > > > > >
>> > > > > > > I'm looking at the linux uvc driver, and noticed after
> resuming
>> my
>> > > > > > ..
>> > > > > >
>> > > > > > Pardon me.. what is the "uvc" driver?  Which module/source
> file is
>> > > that?
>> > > > > >
>> > > > >
>> > > > > http://linux-uvc.berlios.de/ it's not yet included in the kernel
>> > > > > sources although many distributions already ship it.
>> > > > > A "dry" run putting the device into sleep mode works fine (I
> added a
>> > > > > proc interface for calling those suspend/resume function).
>> > > > >
>> > > >
>> > > > it's not just usb_set_interface that hangs actually.
>> > > > It seems to hang at
>> > > >
>> > > > wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0);
>> > > >
>> > > > in drivers/usb/core/urb.c after resuming. I disabled access to the
> usb
>> > > > subsystem in the uvc driver, although connecting any other usb
> storage
>> > > > fails too, just at the same point.
>> > >
>> > > Which URB is usb_kill_urb() called for?
>> > >
>> >
>> > it's the usb_control_message which calls usb_kill_urb if I haven't got
>> > it wrong. (if you're looking for some other information please let me
>> > know)
>> > Although, I got a bit further with it. The error seems to happen
>> > earlier already.
>> > If I load the driver, and do not access the device after suspending
>> > all usb_control commands fail with -71 eproto.
>> >
>> > Reloading the driver doesn't help at tht point, only reconnecting the
>> > device does.
>> >
>> > The data is transfered using bulk transfer.
>> >
>>
>> 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.
>>
> 
> ok usb_reset_device() did the job after resuming. First problem solved.

hmm... in that case try setting in quirks USB_QUIRK_RESET_RESUME

> 
> Markus
> -
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-- 
Best Regards,

Felipe Balbi
http://felipebalbi.com
me@...ipebalbi.com

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