From 51ad5c92ab0ccfe18023d6ba1287fe330f1862e6 Mon Sep 17 00:00:00 2001
From: Richard Yao <ryao@cs.stonybrook.edu>
Date: Tue, 24 Apr 2012 03:23:53 -0400
Subject: [PATCH] Serialize hotplug events to mimic udev

---
 defaults/initrd.scripts |  7 -------
 defaults/linuxrc        | 11 ++++++++---
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/defaults/initrd.scripts b/defaults/initrd.scripts
index 5d523ab..4aad686 100755
--- a/defaults/initrd.scripts
+++ b/defaults/initrd.scripts
@@ -404,13 +404,6 @@ prompt_user(){
 	esac
 }
 
-setup_hotplug() {
-	if [ "${KV_2_6_OR_GREATER}" ]
-	then
-		echo /sbin/mdev > /proc/sys/kernel/hotplug
-	fi
-}
-
 setup_slowusb() {
 	# This function removes unset DO_slowusb if there is no usb-storage attached.
 	# If noslowusb is set, skip this function
diff --git a/defaults/linuxrc b/defaults/linuxrc
index 23ec2b0..f6c0de5 100755
--- a/defaults/linuxrc
+++ b/defaults/linuxrc
@@ -277,13 +277,18 @@ mount_devfs
 # Mount sysfs
 mount_sysfs
 
-# Setup hotplugging for firmware loading
-setup_hotplug
-
 # Start mdev
 if [ "${KV_2_6_OR_GREATER}" ]
 then
 	good_msg 'Activating mdev'
+
+	# Serialize hotplug events
+	touch /dev/mdev.seq
+
+	# Setup hotplugging for firmware loading
+	echo /sbin/mdev > /proc/sys/kernel/hotplug
+
+	# Setup mdev netlink socket daemon
 	( cd /sys && mdev -s ) || bad_msg "Failed to receive dynamic updates from mdev"
 fi
 
-- 
2.26.2