Reproducible panic on "kldunload i915kms" as of r236822

[Lars Engels]

On Mon, Jun 11, 2012 at 12:19:08PM +0300, Konstantin Belousov wrote:
> On Sun, Jun 10, 2012 at 10:00:09AM -0400, Ed Maste wrote:
> > I'm running CURRENT as of r236822 on my Thinkpad X220 and am starting
> > to experiment with the i915 kms driver. All packages are from the
> > pkgbeta repo; I haven't rebuilt anything yet.  I have
> > xorg-server-1.7.7_5,1 and the vesa driver gets used.  In this
> > configuration I have a reproducible panic unloading i915kms.ko.
> > 
> > Reproduction steps:
> > 
> > 1. kldload i915kms && startx
> > 2. switch back to the text console
> > 3. ^C the x server
> > 4. kldunload i915kms
> 
> Yes, unloading of i915kms does not work. There is much more issues
> then what you reported. I do not consider this very critical, and
> have more urgent items to handle, sorry.

If that's a known error maybe kldunload should return ENODEV to prevent
a user from unnecessarily panicking his system?
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