From owner-freebsd-hackers@FreeBSD.ORG  Tue Apr 13 01:12:11 2010
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Date: Mon, 12 Apr 2010 17:56:37 -0700
From: Patrick Mahan <mahan@mahan.org>
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Subject: KLM unloading on error
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All,

I have a requirement that when a KLM I am building fails during MOD_LOAD,
it should be unloaded.  Currently, I am seeing even if I return an error
(eg. EINVAL or ENOSYS) the KLM is still shown as loaded (using kldstat).
Instead, I would like it to fail and be removed.  Does FreeBSD support this?

Thanks,

Patrick