[PATCH AUTOSEL for 4.4 102/162] irqchip/gic-v3: Report failures in gic_irq_domain_alloc

From: Sasha Levin
Date: Sun Apr 08 2018 - 21:18:22 EST


From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>

[ Upstream commit 63c16c6eacb69d0cbdaee5dea0dd56d238375fe6 ]

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@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
drivers/irqchip/irq-gic-v3.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 3f1c4dea8866..5d93e0254d70 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -802,8 +802,11 @@ 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;
}
--
2.15.1