From 690803acca14e8aa101ca5204f0a23c24d7ad8c3 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Mon, 19 Sep 2016 22:21:18 +0100 Subject: [PATCH] irqchip: i8259: Add domain before mapping parent irq Mapping the parent IRQ will use a virq number which may conflict with the hardcoded I8259A_IRQ_BASE..I8259A_IRQ_BASE+15 range that the i8259 driver expects to be free. If this occurs then we'll hit errors when adding the i8259 IRQ domain, since one of its virq numbers will already be in use. Avoid this by adding the i8259 domain before mapping the parent IRQ, such that the i8259 virq numbers become used before the parent interrupt controller gets a chance to use any of them. Signed-off-by: Paul Burton Acked-by: Thomas Gleixner Cc: Marc Zyngier Cc: Jason Cooper Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14269/ Signed-off-by: Ralf Baechle --- drivers/irqchip/irq-i8259.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c index 6b304eb39bd2..85897fdc1527 100644 --- a/drivers/irqchip/irq-i8259.c +++ b/drivers/irqchip/irq-i8259.c @@ -370,13 +370,15 @@ int __init i8259_of_init(struct device_node *node, struct device_node *parent) struct irq_domain *domain; unsigned int parent_irq; + domain = __init_i8259_irqs(node); + parent_irq = irq_of_parse_and_map(node, 0); if (!parent_irq) { pr_err("Failed to map i8259 parent IRQ\n"); + irq_domain_remove(domain); return -ENODEV; } - domain = __init_i8259_irqs(node); irq_set_chained_handler_and_data(parent_irq, i8259_irq_dispatch, domain); return 0; -- 2.20.1