linux-kernel - [PATCH v1 2/2] irqchip: mips-cpu: Drop unnecessary ack/eoi operations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 17 Jan 2020 08:17:06 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     chenhc@...ote.com, paul.burton@...s.com,
        linux-kernel@...r.kernel.org, maz@...nel.org, tglx@...utronix.de,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v1 2/2] irqchip: mips-cpu: Drop unnecessary ack/eoi operations

Actually, all MIPS processor interrupt lines are level triggered.
So providing ack/eoi operation could lead to some unexpected results,
Like chained IRQ handeler failed to mask upstream CPU IRQ.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 drivers/irqchip/irq-mips-cpu.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/irqchip/irq-mips-cpu.c b/drivers/irqchip/irq-mips-cpu.c
index 95d4fd8f7a96..e34f4317bb88 100644
--- a/drivers/irqchip/irq-mips-cpu.c
+++ b/drivers/irqchip/irq-mips-cpu.c
@@ -51,11 +51,9 @@ static inline void mask_mips_irq(struct irq_data *d)
 
 static struct irq_chip mips_cpu_irq_controller = {
 	.name		= "MIPS",
-	.irq_ack	= mask_mips_irq,
 	.irq_mask	= mask_mips_irq,
 	.irq_mask_ack	= mask_mips_irq,
 	.irq_unmask	= unmask_mips_irq,
-	.irq_eoi	= unmask_mips_irq,
 	.irq_disable	= mask_mips_irq,
 	.irq_enable	= unmask_mips_irq,
 };
@@ -112,11 +110,9 @@ static void mips_mt_send_ipi(struct irq_data *d, unsigned int cpu)
 static struct irq_chip mips_mt_cpu_irq_controller = {
 	.name		= "MIPS",
 	.irq_startup	= mips_mt_cpu_irq_startup,
-	.irq_ack	= mips_mt_cpu_irq_ack,
 	.irq_mask	= mask_mips_irq,
 	.irq_mask_ack	= mips_mt_cpu_irq_ack,
 	.irq_unmask	= unmask_mips_irq,
-	.irq_eoi	= unmask_mips_irq,
 	.irq_disable	= mask_mips_irq,
 	.irq_enable	= unmask_mips_irq,
 #ifdef CONFIG_GENERIC_IRQ_IPI
-- 
2.24.1