autofs4 module reference count

[Michael Tokarev <mjt@xxxxxxxxxx>]

I'm not sure how but it appears that sometimes
after I stop autofs service, the module usage
count goes negative so the module can't be
removed anymore.

This happens on 3.0.29 kernel on which I'm
testing stuff with the user<=>kernel interface
problem on mixed 32/64bit environment, but I
don't see any changes related to this in more
recent kernels.

Current situation I have:

$  lsmod | grep auto
autofs4                22422  2147483647

It happened when I stopped automount
(using /etc/init.d/autofs stop), before
this action the module had 1 usage count
(with only one automount map/mount in use).

Before, when the daemon were stucking all
the time, I had to kill -9 it, and the usage
count was decremented correctly.

It looks like something is decrementing the
usage count twice on the regular path, and
only once on error path.

Thanks,

/mjt
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