linux-kernel - [PATCH] mips: loongson64: lemote-2f: Add IRQF_NO

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Message-Id: <20190304220022.20682-1-tomli@tomli.me>
Date:   Tue,  5 Mar 2019 06:00:22 +0800
From:   Yifeng Li <tomli@...li.me>
To:     linux-mips@...r.kernel.org
Cc:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-kernel@...r.kernel.org,
        Yifeng Li <tomli@...li.me>
Subject: [PATCH] mips: loongson64: lemote-2f: Add IRQF_NO_SUSPEND to "cascade" irqaction.

Timekeeping IRQs from CS5536 MFGPT are routed to i8259, which then
triggers the "cascade" IRQ on MIPS CPU. Without IRQF_NO_SUSPEND in
cascade_irqaction, MFGPT interrupts will be masked in suspend mode,
and the machine would be unable to resume once suspended.

Previously, MIPS IRQs were not disabled properly, so the original
code appeared to work. Commit a3e6c1eff5 (MIPS: IRQ: Fix disable_irq
on CPU IRQs) uncovers the bug. To fix it, add IRQF_NO_SUSPEND to
cascade_irqaction.

This commit is functionally identical to 0add9c2f1cff ("MIPS:
Loongson-3: Add IRQF_NO_SUSPEND to Cascade irqaction"), but it forgot
to apply the same fix to Loongson2.

Signed-off-by: Yifeng Li <tomli@...li.me>
---
 arch/mips/loongson64/lemote-2f/irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/loongson64/lemote-2f/irq.c b/arch/mips/loongson64/lemote-2f/irq.c
index 9e33e45aa17c..b213cecb8e3a 100644
--- a/arch/mips/loongson64/lemote-2f/irq.c
+++ b/arch/mips/loongson64/lemote-2f/irq.c
@@ -103,7 +103,7 @@ static struct irqaction ip6_irqaction = {
 static struct irqaction cascade_irqaction = {
 	.handler = no_action,
 	.name = "cascade",
-	.flags = IRQF_NO_THREAD,
+	.flags = IRQF_NO_THREAD | IRQF_NO_SUSPEND,
 };

 void __init mach_init_irq(void)
-- 
2.20.1