modules: Add --first-time switch to modprobe commands

On Linux, kernel modules should be loaded once during boot, either in an
initramfs or by this service.

This does not change anything other than printing out messages if a
module is loaded more than once.

X-Gentoo-Bug: 659530
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=659530

init.d/modules.in

@@ -56,11 +56,12 @@ load_modules()
 		ebegin "Loading module $x"
 		case "$RC_UNAME" in
 			FreeBSD) kldload "$x"; rc=$? ;;
-			Linux) modprobe --use-blacklist -q "$x"; rc=$? ;;
+			Linux) modprobe --first-time -q --use-blacklist "$x"; rc=$? ;;
 			*) ;;
 		esac
 		eend $rc "Failed to load $x"
 	done
+	return 0
 }
 
 modules_load_d()
@@ -118,7 +119,7 @@ Linux_modules()
 			[ -n "${args}" ] && break
 		done
 		[ -z "$args" ] && eval args=\$module_${xx}_args
-		eval modprobe --use-blacklist --verbose "$x" "$args"
+		eval modprobe --first-time --use-blacklist --verbose "$x" "$args"
 	done
 	[ -n "$list" ] && eend
 }