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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 16 Jun 2015 15:31:45 +0200
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Subject: Re: [Qemu-devel] [PATCH] usb: Use usb_bus_find(-1) instead of
 usb_enabled() in usb_device_add/usb_device_del
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To: Lin Ma <lma@suse.com>
Cc: qemu-devel@nongnu.org

On Do, 2015-06-04 at 15:55 +0800, Lin Ma wrote:
> Without usb=on machine option, usb_device_add/usb_device_del don't work,
> Even if there are virtual usb controllers presented.

If you use -device to add your usb host controllers, you should likewise
use -device (or device_add monitor cmd) to add your usb devices.

-usbdevice is legacy syntax and only there for backward compatibility.

cheers,
  Gerd