Messages in this thread | | | Date | Wed, 21 Nov 2007 18:14:01 +0100 | From | "Markus Rechberger" <> | Subject | Re: [linux-usb-devel] USB deadlock after resume |
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On 11/21/07, Alan Stern <stern@rowland.harvard.edu> wrote: > On Wed, 21 Nov 2007, Markus Rechberger wrote: > > > > > 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. > > That's very strange. Getting -71 errors is understandable; it > indicates that the device can't handle being suspended. But the > wait_event() line still shouldn't hang. If it does, it indicates that > there's something wrong with the USB host controller, not just the > device. > > Can you try testing this on a different sort of computer? >
Not really, suspending doesn't work at all on my other notebook it just freezes.. I'm basically trying to get that driver work on my eee PC [1], it's cheap and tiny so I don't expect anything special in there.. The system is preloaded with Xandros (it's debian etch with a few custom applications) and linux 2.6.21.4.
The system still locks up, although only if I leave the video application running during suspending. I don't have to reload the driver anymore after resuming if the video node doesn't get accessed (I'm looking for races in the uvc driver at the moment).
thanks, Markus
[1] http://eeepc.asus.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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