[Qemu-devel] [PATCH] usb-ehci: Clear the portstatus powner bit on device disconnect

[Hans de Goede <hdegoede@redhat.com>]

According to the EHCI spec port ownerhsip 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>
---
 hw/usb-ehci.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
index a946e1d..69bcc4b 100644
--- a/hw/usb-ehci.c
+++ b/hw/usb-ehci.c
@@ -764,6 +764,11 @@ 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;
     }
 
-- 
1.7.7.4