linux-kernel - [PATCH 03/18] c6x: replace setup_irq() by request

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Date:   Wed, 12 Feb 2020 13:32:54 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     linux-c6x-dev@...ux-c6x.org, linux-kernel@...r.kernel.org
Cc:     Mark Salter <msalter@...hat.com>,
        Aurelien Jacquiot <jacquiot.aurelien@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Enrico Weigelt <info@...ux.net>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>
Subject: [PATCH 03/18] c6x: replace setup_irq() by request_irq()

request_irq() is preferred over setup_irq(). Existing callers of
setup_irq() reached mostly via 'init_IRQ()' & '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wherever that has been found, it too has been replaced by free_irq().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>
---

Since cc'ing cover letter to all maintainers/reviewers would be too
many, refer for cover letter,
 https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com

 arch/c6x/platforms/timer64.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/c6x/platforms/timer64.c b/arch/c6x/platforms/timer64.c
index d98d94303498..ceee34c51d4b 100644
--- a/arch/c6x/platforms/timer64.c
+++ b/arch/c6x/platforms/timer64.c
@@ -165,13 +165,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction timer_iact = {
-	.name		= "timer",
-	.flags		= IRQF_TIMER,
-	.handler	= timer_interrupt,
-	.dev_id		= &t64_clockevent_device,
-};
-
 void __init timer64_init(void)
 {
 	struct clock_event_device *cd = &t64_clockevent_device;
@@ -238,7 +231,9 @@ void __init timer64_init(void)
 	cd->cpumask		= cpumask_of(smp_processor_id());
 
 	clockevents_register_device(cd);
-	setup_irq(cd->irq, &timer_iact);
+	if (request_irq(cd->irq, timer_interrupt, IRQF_TIMER, "timer",
+			&t64_clockevent_device))
+		pr_err("request_irq() on %s failed\n", "timer");
 
 out:
 	of_node_put(np);
-- 
2.24.1