Commit d55ebf55 authored by Jason Wessel's avatar Jason Wessel Committed by Anthony Liguori
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USB serial device support

Add in a workaround to allow the usb serial devices to work with the
usb pass through mechanism.  The ioctl() to request an alternate
interface will always return < 0 for a usb-serial device based on the
kernel driver.  This means there is no alternate interface end point.

This was fully tested with a pl2303 usb serial device.
Signed-off-by: default avatarJason Wessel <>
parent 40ff1624
......@@ -833,8 +833,7 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
if (ret < 0) {
return 1;
alt_interface = interface;
/* the current interface descriptor is the active interface
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