From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: Tue, 4 Jul 2017 10:56:33 +0100
Subject: irqchip/gic-v3: Report failures in gic_irq_domain_alloc
Patch-mainline: v4.13-rc6
Git-commit: 63c16c6eacb69d0cbdaee5dea0dd56d238375fe6
References: FATE#323954

If the GIC cannot map an IRQ via irq_domain_ops->alloc(), it doesn't
return an error code.  This can cause a problem with drivers, where
it thinks it has successfully got an IRQ for the device, but requesting
the same ends up failure with -ENOSYS (as the IRQ's chip is not set).

Fixes: commit 443acc4f37f6 ("irqchip: GICv3: Convert to domain hierarchy")
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
 drivers/irqchip/irq-gic-v3.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -831,8 +831,11 @@
 	if (ret)
 		return ret;
 
-	for (i = 0; i < nr_irqs; i++)
-		gic_irq_domain_map(domain, virq + i, hwirq + i);
+	for (i = 0; i < nr_irqs; i++) {
+		ret = gic_irq_domain_map(domain, virq + i, hwirq + i);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }