usb: add serial bus property

This patch adds a serial property for all usb devices, which can be
used to set the serial number of a usb device (as listed by lsusb -v)
to a specific value.  Applies to emulated devices only.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/hw/usb/desc.c b/hw/usb/desc.c
index fce303e9c8..bf6c522682 100644
--- a/hw/usb/desc.c
+++ b/hw/usb/desc.c
@@ -566,6 +566,12 @@ void usb_desc_create_serial(USBDevice *dev)
     char *path;
     int dst;
 
+    if (dev->serial) {
+        /* 'serial' usb bus property has priority if present */
+        usb_desc_set_string(dev, index, dev->serial);
+        return;
+    }
+
     assert(index != 0 && desc->str[index] != NULL);
     dst = snprintf(serial, sizeof(serial), "%s", desc->str[index]);
     path = qdev_get_dev_path(hcd);