linux-kernel - [PATCH v3 1/2] irqchip/loongson-eiointc: Fix return value checking of eiointc

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Message-Id: <20230711120807.1805186-2-maobibo@loongson.cn>
Date:   Tue, 11 Jul 2023 20:08:06 +0800
From:   Bibo Mao <maobibo@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn
Subject: [PATCH v3 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 causes logic
problem. There is eioint initialization problem on qemu virt-machine
where there is only one eioint node and more than 4 vcpus. Nodemap of
eioint is 1, and external device intr can only be routed to vcpu 0-3, the
other vcpus can not response any external device interrupts and only local
processor interrupts like ipi/timer can work.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 drivers/irqchip/irq-loongson-eiointc.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c
index 92d8aa28bdf5..1c5a5b59f199 100644
--- a/drivers/irqchip/irq-loongson-eiointc.c
+++ b/drivers/irqchip/irq-loongson-eiointc.c
@@ -144,12 +144,14 @@ 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");
-		return -1;
-	}
+	/*
+	 * qemu virt-machine has only one eio intc and more than four cpus
+	 * irq from eio can only be routed to cpu 0-3 on virt machine
+	 */
+	if (index < 0)
+		return 0;
 
 	if ((cpu_logical_map(cpu) % CORES_PER_EIO_NODE) == 0) {
 		eiointc_enable();
-- 
2.27.0