linux-kernel - [PATCH 4.9 095/105] ARCv2: IRQ: Call entry/exit functions for chained handlers in MCIP

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Message-Id: <20170804231557.663447039@linuxfoundation.org>
Date:   Fri,  4 Aug 2017 16:16:03 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yuriy Kolerov <yuriy.kolerov@...opsys.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 095/105] ARCv2: IRQ: Call entry/exit functions for chained handlers in MCIP

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yuriy Kolerov <yuriy.kolerov@...opsys.com>


[ Upstream commit e51d5d02f688c45b6f644f472f0c80fdfa73f0cb ]

It is necessary to call entry/exit functions for parent interrupt
controllers for proper masking/unmasking of interrupt lines.

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@...opsys.com>
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arc/kernel/mcip.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/arc/kernel/mcip.c
+++ b/arch/arc/kernel/mcip.c
@@ -10,6 +10,7 @@
 
 #include <linux/smp.h>
 #include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/spinlock.h>
 #include <asm/irqflags-arcv2.h>
 #include <asm/mcip.h>
@@ -221,10 +222,13 @@ static irq_hw_number_t idu_first_hwirq;
 static void idu_cascade_isr(struct irq_desc *desc)
 {
 	struct irq_domain *idu_domain = irq_desc_get_handler_data(desc);
+	struct irq_chip *core_chip = irq_desc_get_chip(desc);
 	irq_hw_number_t core_hwirq = irqd_to_hwirq(irq_desc_get_irq_data(desc));
 	irq_hw_number_t idu_hwirq = core_hwirq - idu_first_hwirq;
 
+	chained_irq_enter(core_chip, desc);
 	generic_handle_irq(irq_find_mapping(idu_domain, idu_hwirq));
+	chained_irq_exit(core_chip, desc);
 }
 
 static int idu_irq_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hwirq)