linux-kernel - [PATCH v2 09/18] parisc: Replace setup_irq() by request

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Message-ID: <2a84ed44c5523d08268547781417c8fc35de3f25.1582471508.git.afzal.mohd.ma@gmail.com>
Date:   Mon, 24 Feb 2020 06:21:11 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 09/18] parisc: Replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). The early boot setup_irq()
invocations happen either via 'init_IRQ()' or 'time_init()', while
memory allocators are ready by 'mm_init()'.

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().

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

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

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

v2:
 * Replace pr_err("request_irq() on %s failed" by
           pr_err("%s: request_irq() failed"
 * Commit message massage

 arch/parisc/kernel/irq.c | 21 +++++----------------
 drivers/parisc/eisa.c    |  8 ++------
 2 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index e5fcfb70cc7c..cb48523e7d19 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -560,20 +560,6 @@ void do_cpu_irq_mask(struct pt_regs *regs)
 	goto out;
 }
 
-static struct irqaction timer_action = {
-	.handler = timer_interrupt,
-	.name = "timer",
-	.flags = IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL,
-};
-
-#ifdef CONFIG_SMP
-static struct irqaction ipi_action = {
-	.handler = ipi_interrupt,
-	.name = "IPI",
-	.flags = IRQF_PERCPU,
-};
-#endif
-
 static void claim_cpu_irqs(void)
 {
 	int i;
@@ -583,10 +569,13 @@ static void claim_cpu_irqs(void)
 	}
 
 	irq_set_handler(TIMER_IRQ, handle_percpu_irq);
-	setup_irq(TIMER_IRQ, &timer_action);
+	if (request_irq(TIMER_IRQ, timer_interrupt,
+			IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL, "timer", NULL))
+		pr_err("%s: request_irq() failed\n", "timer");
 #ifdef CONFIG_SMP
 	irq_set_handler(IPI_IRQ, handle_percpu_irq);
-	setup_irq(IPI_IRQ, &ipi_action);
+	if (request_irq(IPI_IRQ, ipi_interrupt, IRQF_PERCPU, "IPI", NULL))
+		pr_err("%s: request_irq() failed\n", "IPI");
 #endif
 }
 
diff --git a/drivers/parisc/eisa.c b/drivers/parisc/eisa.c
index 9d00a24277aa..213d21f228e7 100644
--- a/drivers/parisc/eisa.c
+++ b/drivers/parisc/eisa.c
@@ -243,11 +243,6 @@ static irqreturn_t dummy_irq2_handler(int _, void *dev)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction irq2_action = {
-	.handler = dummy_irq2_handler,
-	.name = "cascade",
-};
-
 static void init_eisa_pic(void)
 {
 	unsigned long flags;
@@ -335,7 +330,8 @@ static int __init eisa_probe(struct parisc_device *dev)
 	}
 
 	/* Reserve IRQ2 */
-	setup_irq(2, &irq2_action);
+	if (request_irq(2, dummy_irq2_handler, 0, "cascade", NULL))
+		pr_err("%s: request_irq() failed\n", "cascade");
 	for (i = 0; i < 16; i++) {
 		irq_set_chip_and_handler(i, &eisa_interrupt_type,
 					 handle_simple_irq);
-- 
2.25.1