linux-kernel - [PATCH v4 3/5] ARM: cns3xxx: replace setup_irq() by request

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Date:   Fri, 27 Mar 2020 18:14:22 +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 3/5] ARM: cns3xxx: 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: Krzysztof Halasa <khalasa@...p.pl>
---

v4:
 * Add received tags

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-cns3xxx/core.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-cns3xxx/core.c b/arch/arm/mach-cns3xxx/core.c
index 1d61a7701c11..e4f4b20b83a2 100644
--- a/arch/arm/mach-cns3xxx/core.c
+++ b/arch/arm/mach-cns3xxx/core.c
@@ -189,12 +189,6 @@ static irqreturn_t cns3xxx_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction cns3xxx_timer_irq = {
-	.name		= "timer",
-	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= cns3xxx_timer_interrupt,
-};
-
 /*
  * Set up the clock source and clock events devices
  */
@@ -245,7 +239,9 @@ static void __init __cns3xxx_timer_init(unsigned int timer_irq)
 	writel(val, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
 
 	/* Make irqs happen for the system timer */
-	setup_irq(timer_irq, &cns3xxx_timer_irq);
+	if (request_irq(timer_irq, cns3xxx_timer_interrupt,
+			IRQF_TIMER | IRQF_IRQPOLL, "timer", NULL))
+		pr_err("Failed to request irq %d (timer)\n", timer_irq);
 
 	cns3xxx_clockevents_init(timer_irq);
 }
-- 
2.25.1