device_create_file returns 0 but doesn't work

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I am trying to add an additional sysfs attribute to a device (LED) that
is created by another driver.  (My ultimate goal is to provide a way for
a userspace application to use the functionality provided by
led_blink_set, which doesn't currently seem to be possible.)

The kernel module code that sets up all the GPIOs & LEDs in my NAS is
at:

  http://pastebin.com/TJZGww8T

The call to device_create_file is at line 373.

device_create_file is returning 0, but the "foo" attribute is not being
created.  ("find /sys -name '*foo*'" doesn't find anything, so I'm not
just looking in the wrong place.)

What am I doing wrong?

Thanks!

-- 
========================================================================
Ian Pilcher                                         arequipeno@xxxxxxxxx
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

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