From 2aed844c2485cfc07bee58f67be64749655f7f12 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 3 Jun 2019 13:45:49 +0200
Subject: [PATCH 6/9] usb-host: skip reset for untouched devices
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
Message-id: <20190603134550.30153-4-kraxel@redhat.com>
Patchwork-id: 88448
O-Subject: [RHEL-7.7 qemu-kvm-rhev PATCH 3/4] usb-host: skip reset for untouched devices
Bugzilla: 1710861
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

If the guest didn't talk to the device yet, skip the reset.
Without this usb-host devices get resetted a number of times
at boot time for no good reason.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20190522094702.17619-3-kraxel@redhat.com
(cherry picked from commit 65f14ab98da1da920f98ee8734dc1588b01d6b2b)
Signed-off-by: Miroslav Rezanina <mrezanin@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 0425f0e..1d7e386 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -1450,6 +1450,9 @@ static void usb_host_handle_reset(USBDevice *udev)
     if (!s->allow_guest_reset) {
         return;
     }
+    if (udev->addr == 0) {
+        return;
+    }
 
     trace_usb_host_reset(s->bus_num, s->addr);
 
-- 
1.8.3.1