[oe-commits] Alex Olson : udev: only use devtmpfs for udev

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: dylan
Commit: dba106b4fc1579185498b85f6e1ade494fcc588e
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=dba106b4fc1579185498b85f6e1ade494fcc588e

Author: Alex Olson <alex.olson+yocto at gmail.com>
Date:   Tue Jun 25 15:10:48 2013 -0500

udev: only use devtmpfs for udev

Fix for bug: https://bugzilla.yoctoproject.org/show_bug.cgi?id=4632
Since udev 172, the 'mknod' logic was removed from udev. Yocto Dylan
is now using udev 182. This means /dev is now required to be a
devtmpfs filesystem (maintained by the kernel).    If the root
filesystem is a ramdisk,  the kernel's auto-mount of /dev doesn't
activate since there is no rootfs to actually mount...  The bug causes
an unusable system as /dev doesn't contain even basic nodes required
to even get a login prompt.

The Yocto  udev/init script mounts tmpfs if it does not detect tmpfs
or devtmpfs mounted at /dev.  This appears to be  outdated logic that
is no longer correct. I believe the Yocto udev init script should be
checking and mounting only 'devtmpfs' on dev.

(From OE-Core master rev: 31ab19ab69bc6504df01cac7ee0670ca78d247ab)

Signed-off-by: Alex Olson <alex.olson+yocto at gmail.com>

[YOCTO #4632]

Signed-off-by: Saul Wold <sgw at linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

---

 meta/recipes-core/udev/udev/init |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/meta/recipes-core/udev/udev/init b/meta/recipes-core/udev/udev/init
index cd87f50..10f9d1a 100644
--- a/meta/recipes-core/udev/udev/init
+++ b/meta/recipes-core/udev/udev/init
@@ -43,9 +43,9 @@ case "$1" in
         echo "Halting..."
         halt
     fi
-    # mount the tmpfs on /dev, if not already done
-    LANG=C awk '$2 == "/dev" && ($3 == "tmpfs" || $3 == "devtmpfs") { exit 1 }' /proc/mounts && {
-            mount -n -o mode=0755 -t tmpfs none "/dev"
+    # mount the devtmpfs on /dev, if not already done
+    LANG=C awk '$2 == "/dev" && ($3 == "devtmpfs") { exit 1 }' /proc/mounts && {
+            mount -n -o mode=0755 -t devtmpfs none "/dev"
     }
     [ -e /dev/pts ] || mkdir -m 0755 /dev/pts
     [ -e /dev/shm ] || mkdir -m 1777 /dev/shm