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Subject[PATCH 2/2] irqchip/armada-370-xp: Do not allow mapping IRQ 0 and 1
Date
IRQs 0 and 1 cannot be mapped, they are handled internally by this driver
and this driver does not call generic_handle_domain_irq() for these IRQs.
So do not allow mapping these IRQs and correctly propagate error from the
.irq_map callback.

Signed-off-by: Pali Rohár <pali@kernel.org>
Cc: stable@vger.kernel.org
---
drivers/irqchip/irq-armada-370-xp.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 1120084cba09..ebd76ea1c69b 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -546,6 +546,10 @@ static struct irq_chip armada_370_xp_irq_chip = {
static int armada_370_xp_mpic_irq_map(struct irq_domain *h,
unsigned int virq, irq_hw_number_t hw)
{
+ /* IRQs 0 and 1 cannot be mapped, they are handled internally */
+ if (hw <= 1)
+ return -EINVAL;
+
armada_370_xp_irq_mask(irq_get_irq_data(virq));
if (!is_percpu_irq(hw))
writel(hw, per_cpu_int_base +
--
2.20.1
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