linux-kernel - [PATCH v3] irqchip: Replace setup_irq() by request

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Date:   Wed,  4 Mar 2020 06:18:38 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v3] irqchip: Replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Invocations of setup_irq()
occur after memory allocators are ready.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
---

Link to v2 & v1,
[v2] https://lkml.kernel.org/r/cover.1582471508.git.afzal.mohd.ma@gmail.com
[v1] https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com

v3:
 * Split out from tree wide series, as Thomas suggested to get it thr'
	respective maintainers
 * Modify pr_err displayed in case of error
 * Re-arrange code & choose pr_err args as required to improve readability
 * Remove irrelevant parts from commit message & improve
 
v2:
 * Replace pr_err("request_irq() on %s failed" by
           pr_err("%s: request_irq() failed"
 * Commit message massage

 drivers/irqchip/irq-i8259.c   | 16 ++++++----------
 drivers/irqchip/irq-ingenic.c |  9 +++------
 2 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
index d000870d9b6b..b6f6aa7b2862 100644
--- a/drivers/irqchip/irq-i8259.c
+++ b/drivers/irqchip/irq-i8259.c
@@ -268,15 +268,6 @@ static void init_8259A(int auto_eoi)
 	raw_spin_unlock_irqrestore(&i8259A_lock, flags);
 }
 
-/*
- * IRQ2 is cascade interrupt to second interrupt controller
- */
-static struct irqaction irq2 = {
-	.handler = no_action,
-	.name = "cascade",
-	.flags = IRQF_NO_THREAD,
-};
-
 static struct resource pic1_io_resource = {
 	.name = "pic1",
 	.start = PIC_MASTER_CMD,
@@ -311,6 +302,10 @@ static const struct irq_domain_ops i8259A_ops = {
  */
 struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
 {
+	/*
+	 * PIC_CASCADE_IR is cascade interrupt to second interrupt controller
+	 */
+	int irq = I8259A_IRQ_BASE + PIC_CASCADE_IR;
 	struct irq_domain *domain;
 
 	insert_resource(&ioport_resource, &pic1_io_resource);
@@ -323,7 +318,8 @@ struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
 	if (!domain)
 		panic("Failed to add i8259 IRQ domain");
 
-	setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
+	if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
+		pr_err("Failed to register cascade interrupt\n");
 	register_syscore_ops(&i8259_syscore_ops);
 	return domain;
 }
diff --git a/drivers/irqchip/irq-ingenic.c b/drivers/irqchip/irq-ingenic.c
index c5589ee0dfb3..9f3da4260ca6 100644
--- a/drivers/irqchip/irq-ingenic.c
+++ b/drivers/irqchip/irq-ingenic.c
@@ -58,11 +58,6 @@ static irqreturn_t intc_cascade(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction intc_cascade_action = {
-	.handler = intc_cascade,
-	.name = "SoC intc cascade interrupt",
-};
-
 static int __init ingenic_intc_of_init(struct device_node *node,
 				       unsigned num_chips)
 {
@@ -130,7 +125,9 @@ static int __init ingenic_intc_of_init(struct device_node *node,
 		irq_reg_writel(gc, IRQ_MSK(32), JZ_REG_INTC_SET_MASK);
 	}
 
-	setup_irq(parent_irq, &intc_cascade_action);
+	if (request_irq(parent_irq, intc_cascade, 0,
+			"SoC intc cascade interrupt", NULL))
+		pr_err("Failed to register SoC intc cascade interrupt\n");
 	return 0;
 
 out_domain_remove:
-- 
2.25.1