Patch "irqchip/armada-370-xp: Do not allow mapping IRQ 0 and 1" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     irqchip-armada-370-xp-do-not-allow-mapping-irq-0-and.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 522637fadc576a550e392ab791936c57b4e1f89e
Author: Pali Rohár <pali@xxxxxxxxxx>
Date:   Fri Jun 21 11:38:28 2024 +0200

    irqchip/armada-370-xp: Do not allow mapping IRQ 0 and 1
    
    [ Upstream commit 3cef738208e5c3cb7084e208caf9bbf684f24feb ]
    
    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>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index 0fd428db3aa4..73c386aba368 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -346,6 +346,10 @@ 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 +




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