[tip: irq/core] irqchip/armada-370-xp: Do not allow mapping IRQ 0 and 1

[tip-bot2 for Pali Rohár]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     3cef738208e5c3cb7084e208caf9bbf684f24feb
Gitweb:        https://git.kernel.org/tip/3cef738208e5c3cb7084e208caf9bbf684f24feb
Author:        Pali Rohár <pali@xxxxxxxxxx>
AuthorDate:    Fri, 21 Jun 2024 11:38:28 +02:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Sun, 23 Jun 2024 17:23:08 +02:00

irqchip/armada-370-xp: Do not allow mapping IRQ 0 and 1

IRQs 0 (IPI) and 1 (MSI) are handled internally by this driver,
generic_handle_domain_irq() is never called for these IRQs.

Disallow mapping these IRQs.

[ Marek: changed commit message ]

Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
---
 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 676df71..526077d 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -560,6 +560,10 @@ 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 +