[patch 2/6 v2] Add function linkup

[dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org]

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set link up usually include two steps, ip link set <dev> up and
wait_for_if_up <dev>. Now do these two steps in one function linkup.
Later patch will add other code into it.

Signed-off-by: Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 modules.d/40network/net-lib.sh |    5 +++++
 1 file changed, 5 insertions(+)

--- dracut.orig/modules.d/40network/net-lib.sh
+++ dracut/modules.d/40network/net-lib.sh
@@ -338,3 +338,8 @@ wait_for_route_ok() {
     done
     return 1
 }
+
+linkup() {
+    ip link set $1 up 2>/dev/null && wait_for_if_up $1 2>/dev/null
+}
+