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

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Date:   Sun,  1 Mar 2020 17:53:15 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     afzal mohammed <afzal.mohd.ma@...il.com>
Subject: [PATCH v3] ARM: spear: 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-spear/time.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-spear/time.c b/arch/arm/mach-spear/time.c
index 289e036c9c30..d1fdb6066f7b 100644
--- a/arch/arm/mach-spear/time.c
+++ b/arch/arm/mach-spear/time.c
@@ -181,12 +181,6 @@ static irqreturn_t spear_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction spear_timer_irq = {
-	.name = "timer",
-	.flags = IRQF_TIMER,
-	.handler = spear_timer_interrupt
-};
-
 static void __init spear_clockevent_init(int irq)
 {
 	u32 tick_rate;
@@ -201,7 +195,8 @@ static void __init spear_clockevent_init(int irq)
 
 	clockevents_config_and_register(&clkevt, tick_rate, 3, 0xfff0);
 
-	setup_irq(irq, &spear_timer_irq);
+	if (request_irq(irq, spear_timer_interrupt, IRQF_TIMER, "timer", NULL))
+		pr_err("Failed to request irq %d (timer)\n", irq);
 }
 
 static const struct of_device_id timer_of_match[] __initconst = {
-- 
2.25.1