x86, apic: Move irq_remapping_enabled checks into IRQ-remapping code

Move the three easy to move checks in the x86' apic.c file
into the IRQ-remapping code.
Signed-off-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/kernel/apic/apic.c

@@ -1477,7 +1477,6 @@ void __init bsp_end_local_APIC_setup(void)
 	 * Now that local APIC setup is completed for BP, configure the fault
 	 * handling for interrupt remapping.
 	 */
-	if (irq_remapping_enabled)
 	irq_remap_enable_fault_handling();
 
 }
@@ -2251,7 +2250,6 @@ static int lapic_suspend(void)
 	local_irq_save(flags);
 	disable_local_APIC();
 
-	if (irq_remapping_enabled)
 	irq_remapping_disable();
 
 	local_irq_restore(flags);
@@ -2320,7 +2318,6 @@ static void lapic_resume(void)
 	apic_write(APIC_ESR, 0);
 	apic_read(APIC_ESR);
 
-	if (irq_remapping_enabled)
 	irq_remapping_reenable(x2apic_mode);
 
 	local_irq_restore(flags);

drivers/iommu/irq_remapping.c

@@ -87,7 +87,9 @@ int __init irq_remapping_enable(void)
 
 void irq_remapping_disable(void)
 {
-	if (!remap_ops || !remap_ops->disable)
+	if (!irq_remapping_enabled ||
+	    !remap_ops ||
+	    !remap_ops->disable)
 		return;
 
 	remap_ops->disable();
@@ -95,7 +97,9 @@ void irq_remapping_disable(void)
 
 int irq_remapping_reenable(int mode)
 {
-	if (!remap_ops || !remap_ops->reenable)
+	if (!irq_remapping_enabled ||
+	    !remap_ops ||
+	    !remap_ops->reenable)
 		return 0;
 
 	return remap_ops->reenable(mode);
@@ -103,6 +107,9 @@ int irq_remapping_reenable(int mode)
 
 int __init irq_remap_enable_fault_handling(void)
 {
+	if (!irq_remapping_enabled)
+		return 0;
+
 	if (!remap_ops || !remap_ops->enable_faulting)
 		return -ENODEV;