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Re: [Qemu-devel] USB continuous reset / unplug cleanup not done properly

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] USB continuous reset / unplug cleanup not done properly
Date: Mon, 19 Dec 2011 10:00:16 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111104 Red Hat/3.1.16-2.el6_1 Thunderbird/3.1.16


> 1) Devices get resetted again and again on the host side and do not work
> properly on the guest side - they work fine on the host side outside qemu.

I see those too.  Not clear what is going on here.  usbfs requests seem
to get stuck now and then for not-yet known reasons.  Sometimes they
finish after a few seconds.  Sometimes they get stuck long enougth that
some timeout within the guest fires and the guest resets the device.

I see those with a F16 guest which polls the usb stick with
test-unit-ready requests.  Letting it run idle produces a ...

   usb 1-6: reset high speed USB device number 3 using ehci_hcd

... log line line in the guest now and then.  Tried to write a small
reproducer (tool constantly sending test-unit-ready via usbfs), but that
one works just fine without any hangs.


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