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Date:   Sat,  8 Aug 2020 19:35:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>, Sasha Levin <sashal@...nel.org>,
        linux-mips@...r.kernel.org
Subject: [PATCH AUTOSEL 5.8 61/72] irqchip/loongson-pch-pic: Check return value of irq_domain_translate_twocell()

From: Tiezhu Yang <yangtiezhu@...ngson.cn>

[ Upstream commit 66a535c495f72e1deacc37dfa34acca2a06e3578 ]

Check the return value of irq_domain_translate_twocell() due to
it may returns -EINVAL if failed and use variable fwspec for it,
and then use a new variable parent_fwspec which is proper for
irq_domain_alloc_irqs_parent().

Fixes: ef8c01eb64ca ("irqchip: Add Loongson PCH PIC controller")
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/1594087972-21715-6-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 2a05b9305012b..016f32c4cbe18 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -135,16 +135,19 @@ static int pch_pic_alloc(struct irq_domain *domain, unsigned int virq,
 	int err;
 	unsigned int type;
 	unsigned long hwirq;
-	struct irq_fwspec fwspec;
+	struct irq_fwspec *fwspec = arg;
+	struct irq_fwspec parent_fwspec;
 	struct pch_pic *priv = domain->host_data;
 
-	irq_domain_translate_twocell(domain, arg, &hwirq, &type);
+	err = irq_domain_translate_twocell(domain, fwspec, &hwirq, &type);
+	if (err)
+		return err;
 
-	fwspec.fwnode = domain->parent->fwnode;
-	fwspec.param_count = 1;
-	fwspec.param[0] = hwirq + priv->ht_vec_base;
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 1;
+	parent_fwspec.param[0] = hwirq + priv->ht_vec_base;
 
-	err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
+	err = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
 	if (err)
 		return err;
 
-- 
2.25.1

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