D20263.diff
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	Index: head/sys/x86/iommu/intel_fault.c
	===================================================================
	--- head/sys/x86/iommu/intel_fault.c
	+++ head/sys/x86/iommu/intel_fault.c
	@@ -291,12 +291,12 @@
	dmar_fini_fault_log(struct dmar_unit *unit)
	{

	+ if (unit->fault_taskqueue == NULL)
	+ return;
	+
	DMAR_LOCK(unit);
	dmar_disable_fault_intr(unit);
	DMAR_UNLOCK(unit);
	-
	- if (unit->fault_taskqueue == NULL)
	- return;

	taskqueue_drain(unit->fault_taskqueue, &unit->fault_task);
	taskqueue_free(unit->fault_taskqueue);
	Index: head/sys/x86/iommu/intel_gas.c
	===================================================================
	--- head/sys/x86/iommu/intel_gas.c
	+++ head/sys/x86/iommu/intel_gas.c
	@@ -546,7 +546,7 @@
	return (EBUSY);
	entry->start = prev->end;
	}
	- if (next != NULL && next->start < entry->end &&
	+ if (next->start < entry->end &&
	(next->flags & DMAR_MAP_ENTRY_PLACE) == 0) {
	if ((next->flags & DMAR_MAP_ENTRY_RMRR) == 0)
	return (EBUSY);
	@@ -560,7 +560,7 @@
	dmar_gas_rb_remove(domain, prev);
	prev = NULL;
	}
	- if (next != NULL && next->start < entry->end) {
	+ if (next->start < entry->end) {
	dmar_gas_rb_remove(domain, next);
	next = NULL;
	}
	Index: head/sys/x86/iommu/intel_qi.c
	===================================================================
	--- head/sys/x86/iommu/intel_qi.c
	+++ head/sys/x86/iommu/intel_qi.c
	@@ -425,7 +425,7 @@
	{
	struct dmar_qi_genseq gseq;

	- if (unit->qi_enabled)
	+ if (!unit->qi_enabled)
	return;
	taskqueue_drain(unit->qi_taskqueue, &unit->qi_task);
	taskqueue_free(unit->qi_taskqueue);