[Qemu-devel] [PULL 06/17] usb: add usb_bus_release function

[Gerd Hoffmann <kraxel@redhat.com>]

From: Gonglei <arei.gonglei@huawei.com>

add global variables releasing logic when the usb buses
were removed or hot-unpluged.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/bus.c     | 7 +++++++
 include/hw/usb.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index 516fb52..c7c4dad 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -87,6 +87,13 @@ void usb_bus_new(USBBus *bus, size_t bus_size,
     QTAILQ_INSERT_TAIL(&busses, bus, next);
 }
 
+void usb_bus_release(USBBus *bus)
+{
+    assert(next_usb_bus > 0);
+
+    QTAILQ_REMOVE(&busses, bus, next);
+}
+
 USBBus *usb_bus_find(int busnr)
 {
     USBBus *bus;
diff --git a/include/hw/usb.h b/include/hw/usb.h
index 223a5ae..6b32a3b 100644
--- a/include/hw/usb.h
+++ b/include/hw/usb.h
@@ -529,6 +529,7 @@ struct USBBusOps {
 
 void usb_bus_new(USBBus *bus, size_t bus_size,
                  USBBusOps *ops, DeviceState *host);
+void usb_bus_release(USBBus *bus);
 USBBus *usb_bus_find(int busnr);
 void usb_legacy_register(const char *typename, const char *usbdevice_name,
                          USBDevice *(*usbdevice_init)(USBBus *bus,
-- 
1.8.3.1