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Date:   Mon, 24 Feb 2020 06:20:11 +0530
From:   afzal mohammed <afzal.mohd.ma@gmail.com>
To:     linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org
Cc:     Greg Ungerer <gerg@linux-m68k.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Finn Thain <fthain@telegraphics.com.au>
Subject: [PATCH v2 06/18] m68k: Replace setup_irq() by request_irq()
Message-ID: <00b0bf964278dd0bb3e093283994399ff796cca5.1582471508.git.afzal.mohd.ma@gmail.com>
References: <cover.1582471508.git.afzal.mohd.ma@gmail.com>
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request_irq() is preferred over setup_irq(). The early boot setup_irq()
invocations happen either via 'init_IRQ()' or '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wherever that has been found, it too has been replaced by free_irq().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@gmail.com>
Tested-by: Greg Ungerer <gerg@linux-m68k.org> # ColdFire
---

v2:
 * Replace pr_err("request_irq() on %s failed" by
           pr_err("%s: request_irq() failed"
 * Commit message massage
 * remove now irrelevant comment lines at 3 places

 arch/m68k/68000/timers.c      | 11 ++---------
 arch/m68k/coldfire/pit.c      | 11 ++---------
 arch/m68k/coldfire/sltimers.c | 19 +++++--------------
 arch/m68k/coldfire/timers.c   | 21 +++++----------------
 4 files changed, 14 insertions(+), 48 deletions(-)

diff --git a/arch/m68k/68000/timers.c b/arch/m68k/68000/timers.c
index 71ddb4c98726..55a76a2d3d58 100644
--- a/arch/m68k/68000/timers.c
+++ b/arch/m68k/68000/timers.c
@@ -68,14 +68,6 @@ static irqreturn_t hw_tick(int irq, void *dummy)
 
 /***************************************************************************/
 
-static struct irqaction m68328_timer_irq = {
-	.name	 = "timer",
-	.flags	 = IRQF_TIMER,
-	.handler = hw_tick,
-};
-
-/***************************************************************************/
-
 static u64 m68328_read_clk(struct clocksource *cs)
 {
 	unsigned long flags;
@@ -106,7 +98,8 @@ void hw_timer_init(irq_handler_t handler)
 	TCTL = 0;
 
 	/* set ISR */
-	setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
+	if (request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL))
+		pr_err("%s: request_irq() failed\n", "timer");
 
 	/* Restart mode, Enable int, Set clock source */
 	TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
diff --git a/arch/m68k/coldfire/pit.c b/arch/m68k/coldfire/pit.c
index eb6f16b0e2e6..604acd658dec 100644
--- a/arch/m68k/coldfire/pit.c
+++ b/arch/m68k/coldfire/pit.c
@@ -111,14 +111,6 @@ static irqreturn_t pit_tick(int irq, void *dummy)
 
 /***************************************************************************/
 
-static struct irqaction pit_irq = {
-	.name	 = "timer",
-	.flags	 = IRQF_TIMER,
-	.handler = pit_tick,
-};
-
-/***************************************************************************/
-
 static u64 pit_read_clk(struct clocksource *cs)
 {
 	unsigned long flags;
@@ -156,7 +148,8 @@ void hw_timer_init(irq_handler_t handler)
 	cf_pit_clockevent.min_delta_ticks = 0x3f;
 	clockevents_register_device(&cf_pit_clockevent);
 
-	setup_irq(MCF_IRQ_PIT1, &pit_irq);
+	if (request_irq(MCF_IRQ_PIT1, pit_tick, IRQF_TIMER, "timer", NULL))
+		pr_err("%s: request_irq() failed\n", "timer");
 
 	clocksource_register_hz(&pit_clk, FREQ);
 }
diff --git a/arch/m68k/coldfire/sltimers.c b/arch/m68k/coldfire/sltimers.c
index 1b11e7bacab3..c5d5862e1d2b 100644
--- a/arch/m68k/coldfire/sltimers.c
+++ b/arch/m68k/coldfire/sltimers.c
@@ -50,18 +50,14 @@ irqreturn_t mcfslt_profile_tick(int irq, void *dummy)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction mcfslt_profile_irq = {
-	.name	 = "profile timer",
-	.flags	 = IRQF_TIMER,
-	.handler = mcfslt_profile_tick,
-};
-
 void mcfslt_profile_init(void)
 {
 	printk(KERN_INFO "PROFILE: lodging TIMER 1 @ %dHz as profile timer\n",
 	       PROFILEHZ);
 
-	setup_irq(MCF_IRQ_PROFILER, &mcfslt_profile_irq);
+	if (request_irq(MCF_IRQ_PROFILER, mcfslt_profile_tick, IRQF_TIMER,
+			"profile timer", NULL))
+		pr_err("%s: request_irq() failed\n", "profile timer");
 
 	/* Set up TIMER 2 as high speed profile clock */
 	__raw_writel(MCF_BUSCLK / PROFILEHZ - 1, PA(MCFSLT_STCNT));
@@ -92,12 +88,6 @@ static irqreturn_t mcfslt_tick(int irq, void *dummy)
 	return timer_interrupt(irq, dummy);
 }
 
-static struct irqaction mcfslt_timer_irq = {
-	.name	 = "timer",
-	.flags	 = IRQF_TIMER,
-	.handler = mcfslt_tick,
-};
-
 static u64 mcfslt_read_clk(struct clocksource *cs)
 {
 	unsigned long flags;
@@ -140,7 +130,8 @@ void hw_timer_init(irq_handler_t handler)
 	mcfslt_cnt = mcfslt_cycles_per_jiffy;
 
 	timer_interrupt = handler;
-	setup_irq(MCF_IRQ_TIMER, &mcfslt_timer_irq);
+	if (request_irq(MCF_IRQ_TIMER, mcfslt_tick, IRQF_TIMER, "timer", NULL))
+		pr_err("%s: request_irq() failed\n", "timer");
 
 	clocksource_register_hz(&mcfslt_clk, MCF_BUSCLK);
 
diff --git a/arch/m68k/coldfire/timers.c b/arch/m68k/coldfire/timers.c
index 227aa5d13709..52294c1f01f8 100644
--- a/arch/m68k/coldfire/timers.c
+++ b/arch/m68k/coldfire/timers.c
@@ -82,14 +82,6 @@ static irqreturn_t mcftmr_tick(int irq, void *dummy)
 
 /***************************************************************************/
 
-static struct irqaction mcftmr_timer_irq = {
-	.name	 = "timer",
-	.flags	 = IRQF_TIMER,
-	.handler = mcftmr_tick,
-};
-
-/***************************************************************************/
-
 static u64 mcftmr_read_clk(struct clocksource *cs)
 {
 	unsigned long flags;
@@ -134,7 +126,8 @@ void hw_timer_init(irq_handler_t handler)
 
 	timer_interrupt = handler;
 	init_timer_irq();
-	setup_irq(MCF_IRQ_TIMER, &mcftmr_timer_irq);
+	if (request_irq(MCF_IRQ_TIMER, mcftmr_tick, IRQF_TIMER, "timer", NULL))
+		pr_err("%s: request_irq() failed\n", "timer");
 
 #ifdef CONFIG_HIGHPROFILE
 	coldfire_profile_init();
@@ -170,12 +163,6 @@ irqreturn_t coldfire_profile_tick(int irq, void *dummy)
 
 /***************************************************************************/
 
-static struct irqaction coldfire_profile_irq = {
-	.name	 = "profile timer",
-	.flags	 = IRQF_TIMER,
-	.handler = coldfire_profile_tick,
-};
-
 void coldfire_profile_init(void)
 {
 	printk(KERN_INFO "PROFILE: lodging TIMER2 @ %dHz as profile timer\n",
@@ -188,7 +175,9 @@ void coldfire_profile_init(void)
 	__raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 |
 		MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR));
 
-	setup_irq(MCF_IRQ_PROFILER, &coldfire_profile_irq);
+	if (request_irq(MCF_IRQ_PROFILER, coldfire_profile_tick, IRQF_TIMER,
+			"profile timer", NULL))
+		pr_err("%s: request_irq() failed\n", "profile timer");
 }
 
 /***************************************************************************/
-- 
2.25.1