Re: [Qemu-devel] [5050] uhci: rewrite UHCI emulator, fully async operation with multiple outstanding transactions ( Max Krasnyansky)

[Max Krasnyansky <maxk@kernel.org>]

Aurelien Jarno wrote:
> I am using QEMU, from the SVN, without KQEMU. The problem does not
> depend of the console used (SDL, VNC or curses). The guest kernel 
> outputs the following errors:
> usb 1-2: device not accepting address 2, error -71
> usb 1-2: new full speed USB device using uhci_hcd and address 3
> usb 1-2: device not accepting address 3, error -71
> usb 1-2: new full speed USB device using uhci_hcd and address 4
> usb 1-2: device not accepting address 4, error -71
> usb 1-2: new full speed USB device using uhci_hcd and address 5
> usb 1-2: device not accepting address 5, error -71
> 
> You can download the image from:
> http://people.debian.org/~aurel32/qemu/amd64/
> 
> It is reproducible with the following command line:
> qemu-system-x86_64 -hda debian_etch_amd64_small.qcow -usbdevice tablet                                          
> 
> The error can also be reproduced with -usbdevice mouse or -usbdevice 
> disk:image.
Turns out I managed to screw up transaction length handling for control
transfers in certain scenarious. Looks like XP and newer kernels are not
sensitive to that.

I just sent out a patch that fixes the regression.

[PATCH] uhci: Fixed length handling for SETUP and OUT tokens

Please confirm that it fixes your setup. I tested XP, your Debian image and
Fedora 9.

Max