From 0c89167c7608e22c8e933d230aa5035f7e3dcc88 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Thu, 24 May 2018 15:24:42 +0000
Subject: [PATCH] Add function to wait for USB ethernet attach to complete.

MFC after:	1 week
Sponsored by:	Mellanox Technologies
---
 sys/dev/usb/net/usb_ethernet.c | 11 +++++++++++
 sys/dev/usb/net/usb_ethernet.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/sys/dev/usb/net/usb_ethernet.c b/sys/dev/usb/net/usb_ethernet.c
index 53c40302d491..3dda564d523b 100644
--- a/sys/dev/usb/net/usb_ethernet.c
+++ b/sys/dev/usb/net/usb_ethernet.c
@@ -190,6 +190,17 @@ uether_ifattach(struct usb_ether *ue)
 	return (error);
 }
 
+void
+uether_ifattach_wait(struct usb_ether *ue)
+{
+
+	UE_LOCK(ue);
+	usb_proc_mwait(&ue->ue_tq,
+	    &ue->ue_sync_task[0].hdr,
+	    &ue->ue_sync_task[1].hdr);
+	UE_UNLOCK(ue);
+}
+
 static void
 ue_attach_post_task(struct usb_proc_msg *_task)
 {
diff --git a/sys/dev/usb/net/usb_ethernet.h b/sys/dev/usb/net/usb_ethernet.h
index 59c41a9171b0..b288e7ae606b 100644
--- a/sys/dev/usb/net/usb_ethernet.h
+++ b/sys/dev/usb/net/usb_ethernet.h
@@ -113,6 +113,7 @@ struct ifnet	*uether_getifp(struct usb_ether *);
 struct mii_data *uether_getmii(struct usb_ether *);
 void		*uether_getsc(struct usb_ether *);
 int		uether_ifattach(struct usb_ether *);
+void		uether_ifattach_wait(struct usb_ether *);
 void		uether_ifdetach(struct usb_ether *);
 int		uether_ifmedia_upd(struct ifnet *);
 void		uether_init(void *);