[Qemu-devel] [PATCH 2/3] uhci: Don't allow the guest to set port-enabled when there is no dev connected

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

It is possible for device disconnect and the guest trying to reset the port
(because of USB xact errors prior to the disconnect getting signaled) to race,
when we hit this race, the guest will write the port-control register with its
pre-disconnect value + the reset bit set, after which we have a disconnected
device with its port-enabled bit set in its port-control register, which
is no good :)

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 hw/usb/hcd-uhci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c
index ef32633..078be2a 100644
--- a/hw/usb/hcd-uhci.c
+++ b/hw/usb/hcd-uhci.c
@@ -556,6 +556,10 @@ static void uhci_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
                 }
             }
             port->ctrl &= UHCI_PORT_READ_ONLY;
+            /* enabled may only be set if a device is connected */
+            if (!(port->ctrl & UHCI_PORT_CCS)) {
+                val &= ~UHCI_PORT_EN;
+            }
             port->ctrl |= (val & ~UHCI_PORT_READ_ONLY);
             /* some bits are reset when a '1' is written to them */
             port->ctrl &= ~(val & UHCI_PORT_WRITE_CLEAR);
-- 
1.8.0