[Qemu-devel] qdev: USB is not working

[Qemu-devel] qdev: USB is not working

[Luiz Capitulino]

 Hi Gerd,

 When trying to add a USB device to QEMU (either by command-line or
the Monitor) I'm getting the following error:

"""
husb: open device 1.5
usb_create: no bus specified, using "usb.0" for "USB Host Device"
husb: config #1 need -1
USBDEVFS_DISCONNECT: Invalid argument
"""

 I've tried different devices, as I thought this was a problem with
my box, but got the same problem.. Then I debugged and found out that
the problem was introduced by one of the following commits:

"""
commit a5d2f7273c4f59942cc7ffa763d6b60a6f44e908
Author: Gerd Hoffmann <kraxel@redhat.com>
Date:   Mon Aug 31 14:24:00 2009 +0200

    qdev/usb: make qemu aware of usb busses.
"""

"""
commit 806b60248218bd5f74a8b070f5a99a864e8e51c6
Author: Gerd Hoffmann <kraxel@redhat.com>
Date:   Mon Aug 31 14:23:59 2009 +0200

    qdev/usb: add usb bus support to qdev, convert drivers.
"""

 I can't tell which one introduced the problem because with
commit 806b60248218bd5f74a8b070f5a99a864e8e51c6 I get a segfault,
which was fixed by the other.

 I couldn't revert them either, because there are rejections,
but resetting the tree right before those makes USB work
for me.

[Qemu-devel] Re: qdev: USB is not working

[Gerd Hoffmann]

> """
> husb: open device 1.5
> usb_create: no bus specified, using "usb.0" for "USB Host Device"
> husb: config #1 need -1
> USBDEVFS_DISCONNECT: Invalid argument
> """
>
>   I've tried different devices, as I thought this was a problem with
> my box, but got the same problem..

Looks like you are trying to pass through host devices, correct?

Hooking up virtual mass storage / mouse / tabled works fine, so it is 
probably a bug somewhere in usb-linux.c.  I'll have a look later today.

cheers,
   Gerd

[Qemu-devel] Re: qdev: USB is not working

[Luiz Capitulino]

On Fri, 25 Sep 2009 09:54:58 +0200
Gerd Hoffmann <kraxel@redhat.com> wrote:

> > """
> > husb: open device 1.5
> > usb_create: no bus specified, using "usb.0" for "USB Host Device"
> > husb: config #1 need -1
> > USBDEVFS_DISCONNECT: Invalid argument
> > """
> >
> >   I've tried different devices, as I thought this was a problem with
> > my box, but got the same problem..
> 
> Looks like you are trying to pass through host devices, correct?

 Yes.

> Hooking up virtual mass storage / mouse / tabled works fine, so it is 
> probably a bug somewhere in usb-linux.c.  I'll have a look later today.

 Ok, just to clarify: I found those commits with 'git bisect'.

 Thanks.