From e03e77ba4d0570511fdc1be192459e1160c650a6 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 27 Dec 2023 10:09:24 -0800
Subject: [PATCH] ctl: Always return errno values from ctl_port_register

Return EBUSY instead of a bare 1 if a port number is already active.

Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D42929
---
 sys/cam/ctl/ctl_frontend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/cam/ctl/ctl_frontend.c b/sys/cam/ctl/ctl_frontend.c
index ac41a882db6b..1e4d130950c4 100644
--- a/sys/cam/ctl/ctl_frontend.c
+++ b/sys/cam/ctl/ctl_frontend.c
@@ -162,7 +162,7 @@ ctl_port_register(struct ctl_port *port)
 	if ((port_num < 0) ||
 	    (ctl_set_mask(softc->ctl_port_mask, port_num) < 0)) {
 		mtx_unlock(&softc->ctl_lock);
-		return (1);
+		return (EBUSY);
 	}
 	softc->num_ports++;
 	mtx_unlock(&softc->ctl_lock);