From: Jianmin Lv <lvjianmin@loongson.cn>
Date: Fri, 7 Apr 2023 16:34:53 +0800
Subject: [PATCH] irqchip/loongson-pch-pic: Fix pch_pic_acpi_init calling
References: bsc#1012628
Patch-mainline: 6.3.3
Git-commit: 48ce2d722f7f108f27bedddf54bee3423a57ce57

commit 48ce2d722f7f108f27bedddf54bee3423a57ce57 upstream.

For dual-bridges scenario, pch_pic_acpi_init() will be called
in following path:

cpuintc_acpi_init
  acpi_cascade_irqdomain_init(in cpuintc driver)
    acpi_table_parse_madt
      eiointc_parse_madt
        eiointc_acpi_init /* this will be called two times
                             correspondingto parsing two
                             eiointc entries in MADT under
                             dual-bridges scenario*/
          acpi_cascade_irqdomain_init(in eiointc driver)
            acpi_table_parse_madt
              pch_pic_parse_madt
                pch_pic_acpi_init /* this will be called depend
                                     on valid parent IRQ domain
                                     handle for one or two times
                                     corresponding to parsing
                                     two pchpic entries in MADT
                                     druring calling
                                     eiointc_acpi_init() under
                                     dual-bridges scenario*/

During the first eiointc_acpi_init() calling, the
pch_pic_acpi_init() will be called just one time since only
one valid parent IRQ domain handle will be found for current
eiointc IRQ domain.

During the second eiointc_acpi_init() calling, the
pch_pic_acpi_init() will be called two times since two valid
parent IRQ domain handles will be found. So in pch_pic_acpi_init(),
we must have a reasonable way to prevent from creating second same
pch_pic IRQ domain.

The patch matches gsi base information in created pch_pic IRQ
domains to check if the target domain has been created to avoid the
bug mentioned above.

Cc: stable@vger.kernel.org
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230407083453.6305-6-lvjianmin@loongson.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 437f1af6..e3c698ca 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -403,6 +403,9 @@ int __init pch_pic_acpi_init(struct irq_domain *parent,
 	int ret, vec_base;
 	struct fwnode_handle *domain_handle;
 
+	if (find_pch_pic(acpi_pchpic->gsi_base) >= 0)
+		return 0;
+
 	vec_base = acpi_pchpic->gsi_base - GSI_MIN_PCH_IRQ;
 
 	domain_handle = irq_domain_alloc_fwnode(&acpi_pchpic->address);
-- 
2.35.3