LibBSD | rtemsbsd/mve: Fix the interrupt handler closure and installation order (!155)

[Heinz Junkes (@junkes)]

Heinz Junkes commented: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/155#note_156189


I’ve tested it on the hardware. It seems to be working fine.

Unfortunately, I’ve had the crash again from https://github.com/epics-base/pvxs/pull/197#

The crash reproduced — and critically, DAR/R30 = 0x7c000278, the exact same value as the original crash months ago. That's strong confirmation this is a deterministic corruption pattern, not a random bit-flip, and it happened with !155 in place (both #94 and #105 fixed). This rules out mve_isr/the attach-window race
as the cause of this crash — it's unrelated, and the leading libevent/pipe hypothesis remains the live lead.

The mve fixes are validated as not being the source of this particular bug.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/merge_requests/155#note_156189
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