Restore if_cp.c 1.27

----------------------------
	revision 1.27
	date: 2005/09/19 03:10:16;  author: imp;  state: Exp;  lines: +3 -2
	Make sure that we call if_free(ifp) after bus_teardown_intr.  Since we
	could get an interrupt after we free the ifp, and the interrupt
	handler depended on the ifp being still alive, this could, in theory,
	cause a crash.  Eliminate this possibility by moving the if_free to
	after the bus_teardown_intr() call.

In fact, this change do nothing for this driver. It is protected from
this by cp_destroy variable. This variable also protects driver from initiation
of any activity from network stack with disabled intr handler with this change
applied.

sys/dev/cp/if_cp.c

@@ -614,6 +614,9 @@ static int cp_detach (device_t dev)
 	cp_reset (b, 0 ,0);
 	callout_stop (&led_timo[b->num]);
 
+	/* Disable the interrupt request. */
+	bus_teardown_intr (dev, bd->cp_irq, bd->cp_intrhand);
+
 	for (c=b->chan; c<b->chan+NCHAN; ++c) {
 		drv_t *d = (drv_t*) c->sys;
 
@@ -646,8 +649,6 @@ static int cp_detach (device_t dev)
 	b->sys = NULL;
 	CP_UNLOCK (bd);
 
-	/* Disable the interrupt request. */
-	bus_teardown_intr (dev, bd->cp_irq, bd->cp_intrhand);
 	bus_deactivate_resource (dev, SYS_RES_IRQ, 0, bd->cp_irq);
 	bus_release_resource (dev, SYS_RES_IRQ, 0, bd->cp_irq);
 	bus_release_resource (dev, SYS_RES_MEMORY, PCIR_BAR(0), bd->cp_res);