irqdomain: Do irq_find_mapping and set_type for hierarchy irqdomain in case OF

It is possible to call irq_create_of_mapping to create/translate the
same IRQ from DT for multiple times. Perform irq_find_mapping check
and set_type for hierarchy irqdomain in irq_create_of_mapping() to
avoid duplicate these functionality in all outer most irqdomain.

Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 43f3be6..9a61de2 100644 (file)
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -478,11 +478,6 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
                return 0;
        }
 
-       if (irq_domain_is_hierarchy(domain)) {
-               virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data);
-               return virq <= 0 ? 0 : virq;
-       }
-
        /* If domain has no translation, then we assume interrupt line */
        if (domain->ops->xlate == NULL)
                hwirq = irq_data->args[0];
@@ -492,10 +487,24 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
                        return 0;
        }
 
-       /* Create mapping */
-       virq = irq_create_mapping(domain, hwirq);
-       if (!virq)
-               return virq;
+       if (irq_domain_is_hierarchy(domain)) {
+               /*
+                * If we've already configured this interrupt,
+                * don't do it again, or hell will break loose.
+                */
+               virq = irq_find_mapping(domain, hwirq);
+               if (virq)
+                       return virq;
+
+               virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data);
+               if (virq <= 0)
+                       return 0;
+       } else {
+               /* Create mapping */
+               virq = irq_create_mapping(domain, hwirq);
+               if (!virq)
+                       return virq;
+       }
 
        /* Set type if specified and different than the current one */
        if (type != IRQ_TYPE_NONE &&