usb: ehci: fix memory leak in ehci

In usb_ehci_init function, it initializes 's->ipacket', but there
is no corresponding function to free this. As the ehci can be hotplug
and unplug, this will leak host memory leak. In order to make the
hierarchy clean, we should add a ehci pci finalize function, then call
the clean function in ehci device.
Signed-off-by: NLi Qiang <liqiang6-s@360.cn>
Message-id: 589a85b8.3c2b9d0a.b8e6.1434@mx.google.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-ehci-pci.c

@@ -89,6 +89,14 @@ static void usb_ehci_pci_init(Object *obj)
     usb_ehci_init(s, DEVICE(obj));
 }
 
+static void usb_ehci_pci_finalize(Object *obj)
+{
+    EHCIPCIState *i = PCI_EHCI(obj);
+    EHCIState *s = &i->ehci;
+
+    usb_ehci_finalize(s);
+}
+
 static void usb_ehci_pci_exit(PCIDevice *dev)
 {
     EHCIPCIState *i = PCI_EHCI(dev);
@@ -159,6 +167,7 @@ static const TypeInfo ehci_pci_type_info = {
     .parent = TYPE_PCI_DEVICE,
     .instance_size = sizeof(EHCIPCIState),
     .instance_init = usb_ehci_pci_init,
+    .instance_finalize = usb_ehci_pci_finalize,
     .abstract = true,
     .class_init = ehci_class_init,
 };

hw/usb/hcd-ehci.c

@@ -2545,6 +2545,11 @@ void usb_ehci_init(EHCIState *s, DeviceState *dev)
                                 &s->mem_ports);
 }
 
+void usb_ehci_finalize(EHCIState *s)
+{
+    usb_packet_cleanup(&s->ipacket);
+}
+
 /*
  * vim: expandtab ts=4
  */

hw/usb/hcd-ehci.h

@@ -323,6 +323,7 @@ struct EHCIState {
 extern const VMStateDescription vmstate_ehci;
 
 void usb_ehci_init(EHCIState *s, DeviceState *dev);
+void usb_ehci_finalize(EHCIState *s);
 void usb_ehci_realize(EHCIState *s, DeviceState *dev, Error **errp);
 void usb_ehci_unrealize(EHCIState *s, DeviceState *dev, Error **errp);
 void ehci_reset(void *opaque);