linux-kernel - [PATCH v4 1/5] ARM: ep93xx: Replace setup_irq() by request

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Date:   Fri, 27 Mar 2020 18:11:43 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Arnd Bergmann <arnd@...db.de>, SoC Team <soc@...nel.org>
Cc:     afzal mohammed <afzal.mohd.ma@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Lindgren <tony@...mide.com>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Krzysztof Hałasa <khalasa@...p.pl>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Lubomir Rintel <lkundrak@...sk>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Jason Cooper <jason@...edaemon.net>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        arm-soc <arm@...nel.org>, Olof Johansson <olof@...om.net>
Subject: [PATCH v4 1/5] ARM: ep93xx: 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>
Acked-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
---

v4:
 * Add received tags

v3:
 * Split out from series, also create subarch level patch 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-ep93xx/timer-ep93xx.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-ep93xx/timer-ep93xx.c b/arch/arm/mach-ep93xx/timer-ep93xx.c
index de998830f534..dd4b164d1831 100644
--- a/arch/arm/mach-ep93xx/timer-ep93xx.c
+++ b/arch/arm/mach-ep93xx/timer-ep93xx.c
@@ -117,15 +117,11 @@ static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction ep93xx_timer_irq = {
-	.name		= "ep93xx timer",
-	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= ep93xx_timer_interrupt,
-	.dev_id		= &ep93xx_clockevent,
-};
-
 void __init ep93xx_timer_init(void)
 {
+	int irq = IRQ_EP93XX_TIMER3;
+	unsigned long flags = IRQF_TIMER | IRQF_IRQPOLL;
+
 	/* Enable and register clocksource and sched_clock on timer 4 */
 	writel(EP93XX_TIMER4_VALUE_HIGH_ENABLE,
 	       EP93XX_TIMER4_VALUE_HIGH);
@@ -136,7 +132,9 @@ void __init ep93xx_timer_init(void)
 			     EP93XX_TIMER4_RATE);
 
 	/* Set up clockevent on timer 3 */
-	setup_irq(IRQ_EP93XX_TIMER3, &ep93xx_timer_irq);
+	if (request_irq(irq, ep93xx_timer_interrupt, flags, "ep93xx timer",
+			&ep93xx_clockevent))
+		pr_err("Failed to request irq %d (ep93xx timer)\n", irq);
 	clockevents_config_and_register(&ep93xx_clockevent,
 					EP93XX_TIMER123_RATE,
 					1,
-- 
2.25.1