[PATCH] hmm, handle net devices with udev?

Hmm, Arndt Bergmann sent a patch like this one a few weeks ago and
I want to bring the question back, if we want to handle net device
naming with udev.

With this patch it is actually possible to specify something like this
in udev.rules:

  KERNEL="dummy*", SYSFS{address}="00:00:00:00:00:00", SYSFS{features}="0x0", NAME="blind%n"
  KERNEL="eth*", SYSFS{address}="00:0d:60:77:30:91", NAME="private"

and you will get:

  [root@pim udev.kay]# cat /proc/net/dev
  Inter-|   Receive                                                | Transmit
   face |bytes    packets errs drop fifo frame compressed multicast|bytes   packets errs drop fifo colls carrier compressed
       lo:    1500     30    0    0    0     0          0         0    1500      30    0    0    0     0       0          0
  private:  278393   1114    0    0    0     0          0         0  153204    1468    0    0    0     0       0          0
     sit0:       0      0    0    0    0     0          0         0       0       0    0    0    0     0       0          0
   blind0:       0      0    0    0    0     0          0         0       0       0    0    0    0     0       0          0


The udevinfo program is also working:

  [root@pim udev.kay]# ./udevinfo -a -p /sys/class/net/private
    looking at class device '/sys/class/net/private':
      SYSFS{addr_len}="6"
      SYSFS{address}="00:0d:60:77:30:91"
      SYSFS{broadcast}="ff:ff:ff:ff:ff:ff"
      SYSFS{features}="0x3a9"
      SYSFS{flags}="0x1003"
      SYSFS{ifindex}="2"
      SYSFS{iflink}="2"
      SYSFS{mtu}="1500"
      SYSFS{tx_queue_len}="1000"
      SYSFS{type}="1"

  follow the class device's "device"
    looking at the device chain at '/sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0':
      BUS="pci"
      ID="0000:02:01.0"
      SYSFS{class}="0x020000"
      SYSFS{detach_state}="0"
      SYSFS{device}="0x101e"
      SYSFS{irq}="11"
      SYSFS{subsystem_device}="0x0549"
      SYSFS{subsystem_vendor}="0x1014"
      SYSFS{vendor}="0x8086"


The matching device will be renamed to the given name. The device name
will not be put into the udev database, cause the kernel renames the
device and the sysfs name disappears.

I like it, cause it plugs in nicely. We have all the naming features
and sysfs queries and walks inside of  udev. The sysfs timing races
are already solved and the management tools are working for net devices
too. nameif can only match the MAC address now. udev can match any sysfs
value of the device tree the net device is connected to.
But right, net devices do not have device nodes :)

1 files changed, 55 insertions, 55 deletions

diff --git a/test/udev-test.pl b/test/udev-test.pl
index d93ebb9cc3..8ae01c31d4 100644
--- a/test/udev-test.pl
+++ b/test/udev-test.pl
@@ -35,7 +35,7 @@ my @tests = (
 	{
 		desc		=> "label test of scsi disc",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "boot_disk" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="boot_disk%n"
@@ -45,7 +45,7 @@ EOF
 	{
 		desc		=> "label test of scsi partition",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="boot_disk%n"
@@ -54,7 +54,7 @@ EOF
 	{
 		desc		=> "label test of pattern match",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="?IBM-ESXS", NAME="boot_disk%n-1"
@@ -66,7 +66,7 @@ EOF
 	{
 		desc		=> "label test of multiple sysfs files",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", SYSFS{model}="ST336605LW   !#", NAME="boot_diskX%n"
@@ -76,7 +76,7 @@ EOF
 	{
 		desc		=> "label test of max sysfs files",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", SYSFS{model}="ST336605LW    !#", SYSFS{scsi_level}="4", SYSFS{rev}="B245", SYSFS{type}="2", SYSFS{queue_depth}="32", NAME="boot_diskXX%n"
@@ -86,7 +86,7 @@ EOF
 	{
 		desc		=> "catch device by *",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB*", NAME="visor/%n"
@@ -95,7 +95,7 @@ EOF
 	{
 		desc		=> "catch device by * - take 2",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="*USB1", NAME="bad"
@@ -105,7 +105,7 @@ EOF
 	{
 		desc		=> "catch device by ?",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB??*", NAME="visor/%n-1"
@@ -116,7 +116,7 @@ EOF
 	{
 		desc		=> "catch device by character class",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB[A-Z]*", NAME="visor/%n-1"
@@ -127,7 +127,7 @@ EOF
 	{
 		desc		=> "replace kernel name",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor"
@@ -136,7 +136,7 @@ EOF
 	{
 		desc		=> "Handle comment lines in config file (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 # this is a comment
@@ -147,7 +147,7 @@ EOF
 	{
 		desc		=> "Handle comment lines in config file with whitespace (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
  # this is a comment with whitespace before the comment 
@@ -158,7 +158,7 @@ EOF
 	{
 		desc		=> "Handle empty lines in config file (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 
@@ -169,7 +169,7 @@ EOF
 	{
 		desc		=> "subdirectory handling",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "sub/direct/ory/visor" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="sub/direct/ory/visor"
@@ -178,7 +178,7 @@ EOF
 	{
 		desc		=> "place on bus of scsi partition",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "first_disk3" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="first_disk%n"
@@ -187,7 +187,7 @@ EOF
 	{
 		desc		=> "test NAME substitution chars",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "Major:8:minor:3:kernelnumber:3:bus:0:0:0:0" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="Major:%M:minor:%m:kernelnumber:%n:bus:%b"
@@ -196,7 +196,7 @@ EOF
 	{
 		desc		=> "test NAME substitution chars (with length limit)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "M8-m3-n3-b0:0-sIBM" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="M%M-m%m-n%n-b%3b-s%3s{vendor}"
@@ -205,7 +205,7 @@ EOF
 	{
 		desc		=> "old style SYSFS_ attribute",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "good" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS_vendor="IBM-ESXS", NAME="good"
@@ -214,7 +214,7 @@ EOF
 	{
 		desc		=> "sustitution of sysfs value (%s{file})",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "disk-IBM-ESXS-sda" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="disk-%s{vendor}-%k"
@@ -224,7 +224,7 @@ EOF
 	{
 		desc		=> "program result substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "special-device-3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n special-device", RESULT="-special-*", NAME="%c-1-%n"
@@ -237,7 +237,7 @@ EOF
 	{
 		desc		=> "program result substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "test-0:0:0:0" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n test-%b", RESULT="test-0:0*", NAME="%c"
@@ -246,7 +246,7 @@ EOF
 	{
 		desc		=> "program with escaped format char (tricky: callout returns format char!)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "escape-3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n escape-%%n", KERNEL="sda3", NAME="%c"
@@ -255,7 +255,7 @@ EOF
 	{
 		desc		=> "program with lots of arguments",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "foo9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="%c{7}"
@@ -264,7 +264,7 @@ EOF
 	{
 		desc		=> "program with subshell",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "bar9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/sh -c 'echo foo3 foo4 foo5 foo6 foo7 foo8 foo9 | sed  s/foo9/bar9/'", KERNEL="sda3", NAME="%c{7}"
@@ -273,7 +273,7 @@ EOF
 	{
 		desc		=> "program arguments combined with apostrophes",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "foo7" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n 'foo3 foo4'   'foo5   foo6   foo7 foo8'", KERNEL="sda3", NAME="%c{5}"
@@ -282,7 +282,7 @@ EOF
 	{
 		desc		=> "characters before the %c{N} substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "my-foo9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="my-%c{7}"
@@ -291,7 +291,7 @@ EOF
 	{
 		desc		=> "substitute the second to last argument",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "my-foo8" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="my-%c{6}"
@@ -300,7 +300,7 @@ EOF
 	{
 		desc		=> "program result substitution (numbered part of)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "link1" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n node link1 link2", RESULT="node *", NAME="%c{1}", SYMLINK="%c{2} %c{3}"
@@ -309,7 +309,7 @@ EOF
 	{
 		desc		=> "program result substitution (numbered part of+)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "link3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n node link1 link2 link3 link4", RESULT="node *", NAME="%c{1}", SYMLINK="%c{2+}"
@@ -318,7 +318,7 @@ EOF
 	{
 		desc		=> "invalid program for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "TTY" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo", RESULT="foo", NAME="foo"
@@ -328,7 +328,7 @@ EOF
 	{
 		desc		=> "valid program for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "foo" ,
 		conf		=> <<EOF
 PROGRAM="/bin/echo -n foo", RESULT="foo", NAME="foo"
@@ -338,7 +338,7 @@ EOF
 	{
 		desc		=> "invalid label for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "TTY" ,
 		conf		=> <<EOF
 BUS="foo", SYSFS{dev}="5:1", NAME="foo"
@@ -348,7 +348,7 @@ EOF
 	{
 		desc		=> "valid label for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "foo" ,
 		conf		=> <<EOF
 SYSFS{dev}="5:1", NAME="foo"
@@ -358,7 +358,7 @@ EOF
 	{
 		desc		=> "program and bus type match",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0" ,
 		conf		=> <<EOF
 BUS="usb", PROGRAM="/bin/echo -n usb-%b", NAME="%c"
@@ -369,7 +369,7 @@ EOF
 	{
 		desc		=> "symlink creation (same directory)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB[0-9]*", NAME="ttyUSB%n", SYMLINK="visor%n"
@@ -378,7 +378,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link back)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/a/b/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/node", SYMLINK="1/2/a/b/symlink"
@@ -387,7 +387,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link forward)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/symlink"
@@ -396,7 +396,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link back and forward)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/c/d/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/c/d/symlink"
@@ -405,7 +405,7 @@ EOF
 	{
 		desc		=> "multiple symlinks",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "second-0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor", SYMLINK="first-%n second-%n third-%n"
@@ -414,7 +414,7 @@ EOF
 	{
 		desc		=> "create all possible partitions",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "boot_disk15" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME{all_partitions}="boot_disk"
@@ -423,7 +423,7 @@ EOF
 	{
 		desc		=> "sysfs parent hierarchy",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 SYSFS{idProduct}="2008", NAME="visor"
@@ -432,7 +432,7 @@ EOF
 	{
 		desc		=> "name test with ! in the name",
 		subsys		=> "block",
-		devpath		=> "block/rd!c0d0",
+		devpath		=> "/block/rd!c0d0",
 		exp_name	=> "rd/c0d0" ,
 		conf		=> <<EOF
 BUS="scsi", NAME="%k"
@@ -442,7 +442,7 @@ EOF
 	{
 		desc		=> "name test with ! in the name, but no matching rule",
 		subsys		=> "block",
-		devpath		=> "block/rd!c0d0",
+		devpath		=> "/block/rd!c0d0",
 		exp_name	=> "rd/c0d0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor"
@@ -451,7 +451,7 @@ EOF
 	{
 		desc		=> "ID rule",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="usb", ID="0:0:0:0", NAME="not-scsi"
@@ -464,7 +464,7 @@ EOF
 	{
 		desc		=> "ID wildcard all",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:1", NAME="no-match"
@@ -477,7 +477,7 @@ EOF
 	{
 		desc		=> "ID wildcard partial",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:0", NAME="scsi-0:0:0:0"
@@ -487,7 +487,7 @@ EOF
 	{
 		desc		=> "ID wildcard partial 2",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:0:0:0", NAME="scsi-0:0:0:0"
@@ -497,7 +497,7 @@ EOF
 	{
 		desc		=> "ignore SYSFS attribute whitespace",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "ignored",
 		conf		=> <<EOF
 BUS="scsi", SYSFS{whitespace_test}="WHITE  SPACE", NAME="ignored"
@@ -506,7 +506,7 @@ EOF
 	{
 		desc		=> "do not ignore SYSFS attribute whitespace",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "matched-with-space",
 		conf		=> <<EOF
 BUS="scsi", SYSFS{whitespace_test}="WHITE  SPACE ", NAME="wrong-to-ignore"
@@ -516,7 +516,7 @@ EOF
 	{
 		desc		=> "SYMLINK only rule",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "symlink-only2",
 		conf		=> <<EOF
 BUS="scsi", KERNEL="sda", SYMLINK="symlink-only1"
@@ -527,7 +527,7 @@ EOF
 	{
 		desc		=> "permissions test",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "node",
 		exp_perms	=> "5000::0444",
 		conf		=> <<EOF
@@ -537,7 +537,7 @@ EOF
 	{
 		desc		=> "major/minor number test",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "node",
 		exp_majorminor	=> "8:0",
 		conf		=> <<EOF
@@ -547,7 +547,7 @@ EOF
 	{
 		desc		=> "big minor number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-300",
+		devpath		=> "/class/i2c-dev/i2c-300",
 		exp_name	=> "node",
 		exp_majorminor	=> "89:300",
 		conf		=> <<EOF
@@ -557,7 +557,7 @@ EOF
 	{
 		desc		=> "big major number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-fake1",
+		devpath		=> "/class/i2c-dev/i2c-fake1",
 		exp_name	=> "node",
 		exp_majorminor	=> "4095:1",
 		conf		=> <<EOF
@@ -567,7 +567,7 @@ EOF
 	{
 		desc		=> "big major and big minor number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-fake2",
+		devpath		=> "/class/i2c-dev/i2c-fake2",
 		exp_name	=> "node",
 		exp_majorminor	=> "4094:89999",
 		conf		=> <<EOF