From: Gerd Hoffmann <kraxel@redhat.com>
To: erik.rull@rdsoftware.de
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] USB continuous reset / unplug cleanup not done properly
Date: Mon, 19 Dec 2011 10:00:16 +0100 [thread overview]
Message-ID: <4EEEFD20.9000506@redhat.com> (raw)
In-Reply-To: <0N8zjs-1QswR10QHR-00iSes@icpu819.kundenserver.de>
Hi,
> 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.
cheers,
Gerd
next prev parent reply other threads:[~2011-12-19 9:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 14:29 [Qemu-devel] USB continuous reset / unplug cleanup not done properly erik.rull
2011-12-19 9:00 ` Gerd Hoffmann [this message]
2011-12-19 17:31 ` Erik Rull
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