From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: Tue, 4 Jul 2017 09:56:33 +0000 (+0100)
Subject: irqchip/gic-v3: Report failures in gic_irq_domain_alloc
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=63c16c6eacb69d0cbdaee5dea0dd56d238375fe6;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

irqchip/gic-v3: Report failures in gic_irq_domain_alloc

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>
---

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index dbffb7ab6203..47630e9998b3 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -831,8 +831,11 @@ static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
 	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;
 }