From 53de18d0e37557abe409d9e73fcdd08ab5fa0e99 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 20 May 1995 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1995-05-20

---
 carrera/devether.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/carrera/devether.c b/carrera/devether.c
index 647eb7e23022cd036898790f8591ce0919deaeaf..5f5208f9dc06da1009999e252c8b18c056b474ae 100644
--- a/carrera/devether.c
+++ b/carrera/devether.c
@@ -652,6 +652,8 @@ etherattach(char *spec)
 		enable = 1;
 		WR(cr, Rxen);
 	}
+	if(*spec && strcmp(spec, "0") != 0)
+		error(Eio);
 	return devattach('l', spec);
 }