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usb-ehci: Clear the portstatus powner bit on device disconnect 

According to the EHCI spec port ownership should revert to the EHCI controller
on device disconnect. This fixes the problem of a port getting stuck on USB 1
when using redirection and plugging in a USB 2 device after a USB 1 device
has been redirected.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-01-13 14:28:56 +01:00 committed by Gerd Hoffmann
parent 3200d1085d
commit f76e1d8142
1 changed files with 5 additions and 0 deletions
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5
hw/usb-ehci.c
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@ -765,6 +765,11 @@ static void ehci_detach(USBPort *port)
USBPort *companion = s->companion_ports[port->index];
companion->ops->detach(companion);
companion->dev = NULL;
/*
* EHCI spec 4.2.2: "When a disconnect occurs... On the event,
* the port ownership is returned immediately to the EHCI controller."
*/
*portsc &= ~PORTSC_POWNER;
return;
}