linux-kernel - [PATCH v3] ARM: mmp: replace setup_irq() by request

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Message-Id: <20200301122243.4129-1-afzal.mohd.ma@gmail.com>
Date:   Sun,  1 Mar 2020 17:52:41 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Lubomir Rintel <lkundrak@...sk>,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     afzal mohammed <afzal.mohd.ma@...il.com>
Subject: [PATCH v3] ARM: mmp: 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>
---
Hi sub-arch maintainers,

If the patch is okay, please take it thr' your tree.

Regards
afzal

v3:
 * Split out from series, also split out from ARM patch to subarch level
	as Thomas suggested to take it thr' respective maintainers
 * Modify string displayed in case of error as suggested by Thomas
 * Re-arrange code 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

 arch/arm/mach-mmp/time.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
index c65cfc1ad99b..049a65f47b42 100644
--- a/arch/arm/mach-mmp/time.c
+++ b/arch/arm/mach-mmp/time.c
@@ -175,13 +175,6 @@ static void __init timer_config(void)
 	__raw_writel(0x2, mmp_timer_base + TMR_CER);
 }
 
-static struct irqaction timer_irq = {
-	.name		= "timer",
-	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= timer_interrupt,
-	.dev_id		= &ckevt,
-};
-
 void __init mmp_timer_init(int irq, unsigned long rate)
 {
 	timer_config();
@@ -190,7 +183,9 @@ void __init mmp_timer_init(int irq, unsigned long rate)
 
 	ckevt.cpumask = cpumask_of(0);
 
-	setup_irq(irq, &timer_irq);
+	if (request_irq(irq, timer_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
+			"timer", &ckevt))
+		pr_err("Failed to request irq %d (timer)\n", irq);
 
 	clocksource_register_hz(&cksrc, rate);
 	clockevents_config_and_register(&ckevt, rate, MIN_DELTA, MAX_DELTA);
-- 
2.25.1