D54615.diff
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	diff --git a/sys/dev/asmc/asmc.c b/sys/dev/asmc/asmc.c
	--- a/sys/dev/asmc/asmc.c
	+++ b/sys/dev/asmc/asmc.c
	@@ -791,23 +791,13 @@
	static int
	asmc_detach(device_t dev)
	{
	- struct asmc_softc *sc = device_get_softc(dev);
	-
	- if (sc->sc_sms_tq) {
	- taskqueue_drain(sc->sc_sms_tq, &sc->sc_sms_task);
	- taskqueue_free(sc->sc_sms_tq);
	- }
	- if (sc->sc_cookie)
	- bus_teardown_intr(dev, sc->sc_irq, sc->sc_cookie);
	- if (sc->sc_irq)
	- bus_release_resource(dev, SYS_RES_IRQ, sc->sc_rid_irq,
	- sc->sc_irq);
	- if (sc->sc_ioport)
	- bus_release_resource(dev, SYS_RES_IOPORT, sc->sc_rid_port,
	- sc->sc_ioport);
	- mtx_destroy(&sc->sc_mtx);

	- return (0);
	+ /*
	+ * Prevent module unload to avoid issues with device reprobing
	+ * via acpi_driver_added() which can cause kernel panics when
	+ * accessing freed driver structures.
	+ */
	+ return (EBUSY);
	}

	static int