irqchip: crossbar: Introduce centralized check for crossbar write

This is a basic check to ensure that crossbar register needs to be
written. This ensures that we have a common check which is used in
both map and unmap logic.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-15-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index c9f068ca7bc9..83f803bfab76 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -84,10 +84,20 @@ static inline int allocate_free_irq(int cb_no)
         return -ENODEV;
 }
 
+static inline bool needs_crossbar_write(irq_hw_number_t hw)
+{
+        if (hw > GIC_IRQ_START)
+                return true;
+
+        return false;
+}
+
 static int crossbar_domain_map(struct irq_domain *d, unsigned int irq,
                                irq_hw_number_t hw)
 {
-        cb->write(hw - GIC_IRQ_START, cb->irq_map[hw - GIC_IRQ_START]);
+        if (needs_crossbar_write(hw))
+                cb->write(hw - GIC_IRQ_START, cb->irq_map[hw - GIC_IRQ_START]);
+
         return 0;
 }
 
@@ -106,7 +116,7 @@ static void crossbar_domain_unmap(struct irq_domain *d, unsigned int irq)
 {
         irq_hw_number_t hw = irq_get_irq_data(irq)->hwirq;
 
-        if (hw > GIC_IRQ_START) {
+        if (needs_crossbar_write(hw)) {
                 cb->irq_map[hw - GIC_IRQ_START] = IRQ_FREE;
                 cb->write(hw - GIC_IRQ_START, cb->safe_map);
         }