Re: USB deadlock after resume

On 11/21/07, Oliver Neukum <oliver@xxxxxxxxxx> wrote:
Am Mittwoch 21 November 2007 schrieb Markus Rechberger:
On 11/21/07, Markus Rechberger <mrechberger@xxxxxxxxx> wrote:
On 11/21/07, Mark Lord <lkml@xxxxxx> 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.

Markus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Relevant Pages

  • Re: USB deadlock after resume
    ... I'm looking at the linux uvc driver, and noticed after resuming ... proc interface for calling those suspend/resume function). ...
    (Linux-Kernel)
  • Re: Logitech Quickcam
    ... This looks like the UVC Driver did recognize the cam. ... No need to install any ...
    (Ubuntu)
  • Re: USB deadlock after resume
    ... I'm looking at the linux uvc driver, and noticed after resuming ... the device using ACPI) should be avoided. ...
    (Linux-Kernel)
  • Re: USB deadlock after resume
    ... I'm looking at the linux uvc driver, and noticed after resuming my ... the device using ACPI) should be avoided. ...
    (Linux-Kernel)
  • Re: USB deadlock after resume
    ... 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 ... Suspend may or may not cut off power. ...
    (Linux-Kernel)