[PATCH 2/4] irqchip/armada-370-xp: Exit ipi_resume() early if IPI is not used

[Marek Behún]

From: Pali Rohár <pali at kernel.org>

Exit ipi_resume() early if IPI is not used.

IPI is used only on systems where the mpic controller does not have a
parent GIC IRQ (e.g. on Armada XP).

Signed-off-by: Pali Rohár <pali at kernel.org>
[ changed commit message and moved the code change into ipi_resume() ]
Signed-off-by: Marek Behún <kabel at kernel.org>
---
 drivers/irqchip/irq-armada-370-xp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index f488c35d9130..65f21624263e 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -29,6 +29,7 @@
 #include <linux/slab.h>
 #include <linux/syscore_ops.h>
 #include <linux/msi.h>
+#include <linux/types.h>
 #include <asm/mach/arch.h>
 #include <asm/exception.h>
 #include <asm/smp_plat.h>
@@ -156,6 +157,12 @@ static DEFINE_MUTEX(msi_used_lock);
 static phys_addr_t msi_doorbell_addr;
 #endif
 
+static inline bool is_ipi_available(void)
+{
+	/* IPI is used only if we do not have parent irq */
+	return parent_irq <= 0;
+}
+
 static inline bool is_percpu_irq(irq_hw_number_t irq)
 {
 	if (irq <= ARMADA_370_XP_MAX_PER_CPU_IRQS)
@@ -429,6 +436,9 @@ static void ipi_resume(void)
 {
 	int i;
 
+	if (!is_ipi_available())
+		return;
+
 	for (i = 0; i < IPI_DOORBELL_END; i++) {
 		int irq;
 
-- 
2.44.2