From 6110ce59af199194ef63cb31ec722487df3f42fe Mon Sep 17 00:00:00 2001
From: Lin Ma <lma@suse.com>
Date: Wed, 24 Jun 2015 13:40:11 +0800
Subject: [PATCH] Re-attach usb device to kernel while usb_host_open fails

Signed-off-by: Lin Ma <lma@suse.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb/host-libusb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index bc2944c6b2..11429f5e73 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -889,6 +889,9 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev)
 fail:
     trace_usb_host_open_failure(bus_num, addr);
     if (s->dh != NULL) {
+        usb_host_release_interfaces(s);
+        libusb_reset_device(s->dh);
+        usb_host_attach_kernel(s);
         libusb_close(s->dh);
         s->dh = NULL;
         s->dev = NULL;