linux-kernel - [irqchip: irq/irqchip-next] irqchip/loongson-pch-pic: Fix potential incorrect hwirq assignment

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Date:   Fri, 16 Jun 2023 12:03:10 -0000
From:   "irqchip-bot for Liu Peibao" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Huacai Chen <chenhuacai@...ngson.cn>,
        Liu Peibao <liupeibao@...ngson.cn>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqchip/loongson-pch-pic: Fix potential
 incorrect hwirq assignment

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     783422e704ca0fa41cb2fe9ed79e46b6fe7eae29
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/783422e704ca0fa41cb2fe9ed79e46b6fe7eae29
Author:        Liu Peibao <liupeibao@...ngson.cn>
AuthorDate:    Wed, 14 Jun 2023 19:59:33 +08:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Fri, 16 Jun 2023 12:59:28 +01:00

irqchip/loongson-pch-pic: Fix potential incorrect hwirq assignment

In DeviceTree path, when ht_vec_base is not zero, the hwirq of PCH PIC
will be assigned incorrectly. Because when pch_pic_domain_translate()
adds the ht_vec_base to hwirq, the hwirq does not have the ht_vec_base
subtracted when calling irq_domain_set_info().

The ht_vec_base is designed for the parent irq chip/domain of the PCH PIC.
It seems not proper to deal this in callbacks of the PCH PIC domain and
let's put this back like the initial commit ef8c01eb64ca ("irqchip: Add
Loongson PCH PIC controller").

Fixes: bcdd75c596c8 ("irqchip/loongson-pch-pic: Add ACPI init support")
Cc: stable@...r.kernel.org
Reviewed-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Liu Peibao <liupeibao@...ngson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@...ngson.cn>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20230614115936.5950-3-lvjianmin@loongson.cn
---
 drivers/irqchip/irq-loongson-pch-pic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 921c5c0..93a71f6 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -164,7 +164,7 @@ static int pch_pic_domain_translate(struct irq_domain *d,
 		if (fwspec->param_count < 2)
 			return -EINVAL;
 
-		*hwirq = fwspec->param[0] + priv->ht_vec_base;
+		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
 	} else {
 		if (fwspec->param_count < 1)
@@ -196,7 +196,7 @@ static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
 
 	parent_fwspec.fwnode = domain->parent->fwnode;
 	parent_fwspec.param_count = 1;
-	parent_fwspec.param[0] = hwirq;
+	parent_fwspec.param[0] = hwirq + priv->ht_vec_base;
 
 	err = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
 	if (err)