linux-kernel - [PATCH v6 1/2] irqchip/loongson-eiointc: Fix return value checking of eiointc

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Date:   Fri, 11 Aug 2023 17:58:04 +0800
From:   Bibo Mao <maobibo@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>, Marc Zyngier <maz@...nel.org>
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        linux-kernel@...r.kernel.org,
        Philippe Mathieu-Daudé <philmd@...aro.org>
Subject: [PATCH v6 1/2] irqchip/loongson-eiointc: Fix return value checking of eiointc_index

Return value of function eiointc_index is int, however it is converted
into uint32_t and then compared smaller than zero, this will cause logic
problem.

Fixes: dd281e1a1a93 ("irqchip: Add Loongson Extended I/O interrupt controller support")
Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>

---
 drivers/irqchip/irq-loongson-eiointc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index 92d8aa28bdf5..1623cd779175 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -144,7 +144,7 @@ static int eiointc_router_init(unsigned int cpu)
 	int i, bit;
 	uint32_t data;
 	uint32_t node = cpu_to_eio_node(cpu);
-	uint32_t index = eiointc_index(node);
+	int index = eiointc_index(node);
 
 	if (index < 0) {
 		pr_err("Error: invalid nodemap!\n");
-- 
2.27.0