Patch "irqchip/riscv-intc: Mark all INTC nodes as initialized" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    irqchip/riscv-intc: Mark all INTC nodes as initialized

to the 6.1-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-riscv-intc-mark-all-intc-nodes-as-initialize.patch
and it can be found in the queue-6.1 subdirectory.

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



commit bc4bbe9dd327cfd448c323137650c7d18199cb4d
Author: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
Date:   Tue Oct 3 10:13:51 2023 +0530

    irqchip/riscv-intc: Mark all INTC nodes as initialized
    
    [ Upstream commit e13cd66bd821be417c498a34928652db4ac6b436 ]
    
    The RISC-V INTC local interrupts are per-HART (or per-CPU) so we
    create INTC IRQ domain only for the INTC node belonging to the boot
    HART. This means only the boot HART INTC node will be marked as
    initialized and other INTC nodes won't be marked which results
    downstream interrupt controllers (such as PLIC, IMSIC and APLIC
    direct-mode) not being probed due to missing device suppliers.
    
    To address this issue, we mark all INTC node for which we don't
    create IRQ domain as initialized.
    
    Reported-by: Dmitry Dunaev <dunaev@xxxxxxxx>
    Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
    Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230926102801.1591126-1-dunaev@xxxxxxxx
    Link: https://lore.kernel.org/r/20231003044403.1974628-4-apatel@xxxxxxxxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index 499e5f81b3fe3..4b66850978e6e 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -110,8 +110,16 @@ static int __init riscv_intc_init(struct device_node *node,
 	 * for each INTC DT node. We only need to do INTC initialization
 	 * for the INTC DT node belonging to boot CPU (or boot HART).
 	 */
-	if (riscv_hartid_to_cpuid(hartid) != smp_processor_id())
+	if (riscv_hartid_to_cpuid(hartid) != smp_processor_id()) {
+		/*
+		 * The INTC nodes of each CPU are suppliers for downstream
+		 * interrupt controllers (such as PLIC, IMSIC and APLIC
+		 * direct-mode) so we should mark an INTC node as initialized
+		 * if we are not creating IRQ domain for it.
+		 */
+		fwnode_dev_initialized(of_fwnode_handle(node), true);
 		return 0;
+	}
 
 	intc_domain = irq_domain_add_linear(node, BITS_PER_LONG,
 					    &riscv_intc_domain_ops, NULL);