From ff8750baf39dfc8936ba4e689fe05abe04cd41c7 Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri, 16 Jan 2015 17:58:21 -0800
Subject: [PATCH] kernel - Augment resource_string_value() to check kenv.

* resource_string_value() now checks for a kenv hint called
  <devname><unit>.<resourcename>, similar to how resource_int_value()
  and resource_long_value() work.
---
 sys/kern/subr_bus.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index 3a64b1d366..79a3b62b73 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -2124,6 +2124,14 @@ resource_string_value(const char *name, int unit, const char *resname,
 {
 	int error;
 	struct config_resource *res;
+	char buf[64];
+	const char *env;
+
+	ksnprintf(buf, sizeof(buf), "%s%d.%s", name, unit, resname);
+	if ((env = kgetenv(buf)) != NULL) {
+		*result = env;
+		return 0;
+	}
 
 	if ((error = resource_find(name, unit, resname, &res)) != 0)
 		return(error);
-- 
2.41.0