From 837f8a853f54361405ade7924a740785dc711542 Mon Sep 17 00:00:00 2001
From: mav <mav@FreeBSD.org>
Date: Thu, 31 Aug 2017 10:59:39 +0000
Subject: [PATCH] Make ntb_set_ctx() always generate fake link event.

It allows application driver get initial link state without racing with
hardware interrupts, thanks to the context rmlock held here.

MFC after:	1 week
Sponsored by:	iXsystems, Inc.
---
 sys/dev/ntb/ntb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sys/dev/ntb/ntb.c b/sys/dev/ntb/ntb.c
index 7515dfcaa49a..fd6e1028891a 100644
--- a/sys/dev/ntb/ntb.c
+++ b/sys/dev/ntb/ntb.c
@@ -264,6 +264,13 @@ ntb_set_ctx(device_t ntb, void *ctx, const struct ntb_ctx_ops *ctx_ops)
 	}
 	nc->ctx = ctx;
 	nc->ctx_ops = ctx_ops;
+
+	/*
+	 * If applicaiton driver asks for link events, generate fake one now
+	 * to let it update link state without races while we hold the lock.
+	 */
+	if (ctx_ops->link_event != NULL)
+		ctx_ops->link_event(ctx);
 	rm_wunlock(&nc->ctx_lock);
 
 	return (0);