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-rw-r--r--hw/usb/dev-serial.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index 45cc74128a..2ba6870b37 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -479,6 +479,10 @@ static void usb_serial_event(void *opaque, int event)
                 usb_device_detach(&s->dev);
             }
             break;
+        case CHR_EVENT_MUX_IN:
+        case CHR_EVENT_MUX_OUT:
+            /* Ignore */
+            break;
     }
 }