[OpenWrt-Devel] use devtmpfs if available and dont let it be unused

[puchu]

Hi

in 2.6.32 devtmpfs a early devfs created by the kernel is available and added 
to the kernel config by default

grep "DEVTMPFS" config-2.6.32
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DEVTMPFS=y

this means: devtmpfs is mounted on root by the kernel. but its not used ...
this patches moves devtmpfs if available to root instead of using devfs...

greets

diff --git a/package/base-files/files/lib/preinit/20_device_fs_mount b/package/base-files/files/lib/preinit/20_device_fs_mount
index 6b2a6e8..86ef93f 100644
--- a/package/base-files/files/lib/preinit/20_device_fs_mount
+++ b/package/base-files/files/lib/preinit/20_device_fs_mount
@@ -2,6 +2,16 @@
 # Copyright (C) 2006 OpenWrt.org
 # Copyright (C) 2010 Vertical Communications
 
+do_move_devtmpfs() {
+    foo="`grep devtmpfs /proc/mounts`"
+    x=${foo#* }
+    x=${x%% *}
+
+    if [ "$x" != "/dev" ] ; then
+	mount -o move "$x" /dev
+    fi
+}
+
 do_mount_devfs() {
     mount devfs /dev -t devfs
 }
@@ -15,7 +25,9 @@ do_mount_udev() {
 }
 
 choose_device_fs() {
-    if grep devfs /proc/filesystems > /dev/null; then
+    if grep devtmpfs /proc/mounts > /dev/null; then
+	do_move_devtmpfs
+    elif grep devfs /proc/filesystems > /dev/null; then
         do_mount_devfs
     elif [ -x /sbin/hotplug2 ]; then
         do_mount_hotplug

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