[Bug 276057] crash in xa_destroy() while initializing the i915kms module

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276057

--- Comment #6 from Donn Seeley <donn@xmission.com> ---
(In reply to Konstantin Belousov from comment #4)
Of course I realized that there would still be a problem when omitting
mtx_destroy() almost immediately after I posted my reply.  D'oh.

I've been staring at the Linux xarray code and the i915kms driver, trying to
figure out a good way to handle this issue.  I could change the i915kms driver
to avoid calling xa_destroy() in guc_init_lrc_mapping() on FreeBSD, but then I
would need to be sure that we _do_ call xa_destroy() when the driver finally
does free the xarray.  I'll look at this in my spare time and I'll see if
there's a reasonable solution.

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