Re: [PATCH v2 02/18] ARM: replace setup_irq() by request_irq()

[Lubomir Rintel <lkundrak@v3.sk>]

On Mon, Feb 24, 2020 at 06:19:04AM +0530, afzal mohammed wrote:
> 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 wherever that has been found, it too has been replaced by free_irq().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>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
> Acked-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> # EP93xx
> Tested-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> # EP93xx
> ---
> 
> 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 +++-------
>  arch/arm/mach-ebsa110/core.c             | 10 +++-------
>  arch/arm/mach-ep93xx/timer-ep93xx.c      | 12 ++++--------
>  arch/arm/mach-footbridge/dc21285-timer.c | 11 +++--------
>  arch/arm/mach-footbridge/isa-irq.c       |  8 ++------
>  arch/arm/mach-footbridge/isa-timer.c     | 11 +++--------
>  arch/arm/mach-iop32x/time.c              | 12 ++++--------
>  arch/arm/mach-mmp/time.c                 | 11 +++--------

Tested-by: Lubomir Rintel <lkundrak@v3.sk> (mmp)

Thanks,
Lubo

>  arch/arm/mach-omap1/pm.c                 | 22 +++++++++++++---------
>  arch/arm/mach-omap1/time.c               | 10 +++-------
>  arch/arm/mach-omap1/timer32k.c           | 10 +++-------
>  arch/arm/mach-omap2/timer.c              | 11 +++--------
>  arch/arm/mach-rpc/time.c                 |  8 ++------
>  arch/arm/mach-spear/time.c               |  9 ++-------
>  arch/arm/plat-orion/time.c               | 10 +++-------
>  15 files changed, 54 insertions(+), 111 deletions(-)
> 
> diff --git a/arch/arm/mach-cns3xxx/core.c b/arch/arm/mach-cns3xxx/core.c
> index 1d61a7701c11..711d88b64f2e 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("%s: request_irq() failed\n", "timer");
>  
>  	cns3xxx_clockevents_init(timer_irq);
>  }
> diff --git a/arch/arm/mach-ebsa110/core.c b/arch/arm/mach-ebsa110/core.c
> index da2ff4f61d6b..dfe6da30a3e0 100644
> --- a/arch/arm/mach-ebsa110/core.c
> +++ b/arch/arm/mach-ebsa110/core.c
> @@ -201,12 +201,6 @@ ebsa110_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction ebsa110_timer_irq = {
> -	.name		= "EBSA110 Timer Tick",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= ebsa110_timer_interrupt,
> -};
> -
>  /*
>   * Set up timer interrupt.
>   */
> @@ -221,7 +215,9 @@ void __init ebsa110_timer_init(void)
>  	__raw_writeb(COUNT & 0xff, PIT_T1);
>  	__raw_writeb(COUNT >> 8, PIT_T1);
>  
> -	setup_irq(IRQ_EBSA110_TIMER0, &ebsa110_timer_irq);
> +	if (request_irq(IRQ_EBSA110_TIMER0, ebsa110_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "EBSA110 Timer Tick", NULL))
> +		pr_err("%s: request_irq() failed\n", "EBSA110 Timer Tick");
>  }
>  
>  static struct plat_serial8250_port serial_platform_data[] = {
> diff --git a/arch/arm/mach-ep93xx/timer-ep93xx.c b/arch/arm/mach-ep93xx/timer-ep93xx.c
> index de998830f534..01f7e2b0b9fe 100644
> --- a/arch/arm/mach-ep93xx/timer-ep93xx.c
> +++ b/arch/arm/mach-ep93xx/timer-ep93xx.c
> @@ -117,13 +117,6 @@ 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)
>  {
>  	/* Enable and register clocksource and sched_clock on timer 4 */
> @@ -136,7 +129,10 @@ 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_TIMER3, ep93xx_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "ep93xx timer",
> +			&ep93xx_clockevent))
> +		pr_err("%s: request_irq() failed\n", "ep93xx timer");
>  	clockevents_config_and_register(&ep93xx_clockevent,
>  					EP93XX_TIMER123_RATE,
>  					1,
> diff --git a/arch/arm/mach-footbridge/dc21285-timer.c b/arch/arm/mach-footbridge/dc21285-timer.c
> index f76212d2dbf1..ce70931037c0 100644
> --- a/arch/arm/mach-footbridge/dc21285-timer.c
> +++ b/arch/arm/mach-footbridge/dc21285-timer.c
> @@ -101,13 +101,6 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction footbridge_timer_irq = {
> -	.name		= "dc21285_timer1",
> -	.handler	= timer1_interrupt,
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.dev_id		= &ckevt_dc21285,
> -};
> -
>  /*
>   * Set up timer interrupt.
>   */
> @@ -118,7 +111,9 @@ void __init footbridge_timer_init(void)
>  
>  	clocksource_register_hz(&cksrc_dc21285, rate);
>  
> -	setup_irq(ce->irq, &footbridge_timer_irq);
> +	if (request_irq(ce->irq, timer1_interrupt, IRQF_TIMER | IRQF_IRQPOLL,
> +			"dc21285_timer1", &ckevt_dc21285))
> +		pr_err("%s: request_irq() failed\n", "dc21285_timer1");
>  
>  	ce->cpumask = cpumask_of(smp_processor_id());
>  	clockevents_config_and_register(ce, rate, 0x4, 0xffffff);
> diff --git a/arch/arm/mach-footbridge/isa-irq.c b/arch/arm/mach-footbridge/isa-irq.c
> index 88a553932c33..a259d5d8eb20 100644
> --- a/arch/arm/mach-footbridge/isa-irq.c
> +++ b/arch/arm/mach-footbridge/isa-irq.c
> @@ -96,11 +96,6 @@ static void isa_irq_handler(struct irq_desc *desc)
>  	generic_handle_irq(isa_irq);
>  }
>  
> -static struct irqaction irq_cascade = {
> -	.handler = no_action,
> -	.name = "cascade",
> -};
> -
>  static struct resource pic1_resource = {
>  	.name	= "pic1",
>  	.start	= 0x20,
> @@ -160,7 +155,8 @@ void __init isa_init_irq(unsigned int host_irq)
>  
>  		request_resource(&ioport_resource, &pic1_resource);
>  		request_resource(&ioport_resource, &pic2_resource);
> -		setup_irq(IRQ_ISA_CASCADE, &irq_cascade);
> +		if (request_irq(IRQ_ISA_CASCADE, no_action, 0, "cascade", NULL))
> +			pr_err("%s: request_irq() failed\n", "cascade");
>  
>  		irq_set_chained_handler(host_irq, isa_irq_handler);
>  
> diff --git a/arch/arm/mach-footbridge/isa-timer.c b/arch/arm/mach-footbridge/isa-timer.c
> index 82f45591fb2c..6c7c6ea03804 100644
> --- a/arch/arm/mach-footbridge/isa-timer.c
> +++ b/arch/arm/mach-footbridge/isa-timer.c
> @@ -25,17 +25,12 @@ static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction pit_timer_irq = {
> -	.name		= "pit",
> -	.handler	= pit_timer_interrupt,
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.dev_id		= &i8253_clockevent,
> -};
> -
>  void __init isa_timer_init(void)
>  {
>  	clocksource_i8253_init();
>  
> -	setup_irq(i8253_clockevent.irq, &pit_timer_irq);
> +	if (request_irq(i8253_clockevent.irq, pit_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "pit", &i8253_clockevent))
> +		pr_err("%s: request_irq() failed\n", "pit");
>  	clockevent_i8253_init(false);
>  }
> diff --git a/arch/arm/mach-iop32x/time.c b/arch/arm/mach-iop32x/time.c
> index 18a4df5c1baa..422e298366bd 100644
> --- a/arch/arm/mach-iop32x/time.c
> +++ b/arch/arm/mach-iop32x/time.c
> @@ -137,13 +137,6 @@ iop_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction iop_timer_irq = {
> -	.name		= "IOP Timer Tick",
> -	.handler	= iop_timer_interrupt,
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.dev_id		= &iop_clockevent,
> -};
> -
>  static unsigned long iop_tick_rate;
>  unsigned long get_iop_tick_rate(void)
>  {
> @@ -168,7 +161,10 @@ void __init iop_init_time(unsigned long tick_rate)
>  	 */
>  	write_tmr0(timer_ctl & ~IOP_TMR_EN);
>  	write_tisr(1);
> -	setup_irq(IRQ_IOP32X_TIMER0, &iop_timer_irq);
> +	if (request_irq(IRQ_IOP32X_TIMER0, iop_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "IOP Timer Tick",
> +			&iop_clockevent))
> +		pr_err("%s: request_irq() failed\n", "IOP Timer Tick");
>  	iop_clockevent.cpumask = cpumask_of(0);
>  	clockevents_config_and_register(&iop_clockevent, tick_rate,
>  					0xf, 0xfffffffe);
> diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
> index c65cfc1ad99b..83af1db45c15 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("%s: request_irq() failed\n", "timer");
>  
>  	clocksource_register_hz(&cksrc, rate);
>  	clockevents_config_and_register(&ckevt, rate, MIN_DELTA, MAX_DELTA);
> diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c
> index d068958d6f8a..a82e220783d1 100644
> --- a/arch/arm/mach-omap1/pm.c
> +++ b/arch/arm/mach-omap1/pm.c
> @@ -596,11 +596,6 @@ static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction omap_wakeup_irq = {
> -	.name		= "peripheral wakeup",
> -	.handler	= omap_wakeup_interrupt
> -};
> -
>  
>  
>  static const struct platform_suspend_ops omap_pm_ops = {
> @@ -655,10 +650,19 @@ static int __init omap_pm_init(void)
>  
>  	arm_pm_idle = omap1_pm_idle;
>  
> -	if (cpu_is_omap7xx())
> -		setup_irq(INT_7XX_WAKE_UP_REQ, &omap_wakeup_irq);
> -	else if (cpu_is_omap16xx())
> -		setup_irq(INT_1610_WAKE_UP_REQ, &omap_wakeup_irq);
> +	if (cpu_is_omap7xx()) {
> +		if (request_irq(INT_7XX_WAKE_UP_REQ, omap_wakeup_interrupt, 0,
> +				"peripheral wakeup", NULL)) {
> +			pr_err("%s: request_irq() failed\n",
> +			       "peripheral wakeup");
> +		}
> +	} else if (cpu_is_omap16xx()) {
> +		if (request_irq(INT_1610_WAKE_UP_REQ, omap_wakeup_interrupt, 0,
> +				"peripheral wakeup", NULL)) {
> +			pr_err("%s: request_irq() failed\n",
> +			       "peripheral wakeup");
> +		}
> +	}
>  
>  	/* Program new power ramp-up time
>  	 * (0 for most boards since we don't lower voltage when in deep sleep)
> diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
> index 524977a31a49..2bd6c4dc6c1f 100644
> --- a/arch/arm/mach-omap1/time.c
> +++ b/arch/arm/mach-omap1/time.c
> @@ -155,15 +155,11 @@ static irqreturn_t omap_mpu_timer1_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction omap_mpu_timer1_irq = {
> -	.name		= "mpu_timer1",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= omap_mpu_timer1_interrupt,
> -};
> -
>  static __init void omap_init_mpu_timer(unsigned long rate)
>  {
> -	setup_irq(INT_TIMER1, &omap_mpu_timer1_irq);
> +	if (request_irq(INT_TIMER1, omap_mpu_timer1_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "mpu_timer1", NULL))
> +		pr_err("%s: request_irq() failed\n", "mpu_timer1");
>  	omap_mpu_timer_start(0, (rate / HZ) - 1, 1);
>  
>  	clockevent_mpu_timer1.cpumask = cpumask_of(0);
> diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c
> index 0ae6c52a7d70..1435faca19d8 100644
> --- a/arch/arm/mach-omap1/timer32k.c
> +++ b/arch/arm/mach-omap1/timer32k.c
> @@ -148,15 +148,11 @@ static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction omap_32k_timer_irq = {
> -	.name		= "32KHz timer",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= omap_32k_timer_interrupt,
> -};
> -
>  static __init void omap_init_32k_timer(void)
>  {
> -	setup_irq(INT_OS_TIMER, &omap_32k_timer_irq);
> +	if (request_irq(INT_OS_TIMER, omap_32k_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "32KHz timer", NULL))
> +		pr_err("%s: request_irq() failed\n", "32KHz timer");
>  
>  	clockevent_32k_timer.cpumask = cpumask_of(0);
>  	clockevents_config_and_register(&clockevent_32k_timer,
> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
> index 0d0a731cb476..7cf91f42dbd1 100644
> --- a/arch/arm/mach-omap2/timer.c
> +++ b/arch/arm/mach-omap2/timer.c
> @@ -91,12 +91,6 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction omap2_gp_timer_irq = {
> -	.name		= "gp_timer",
> -	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
> -	.handler	= omap2_gp_timer_interrupt,
> -};
> -
>  static int omap2_gp_timer_set_next_event(unsigned long cycles,
>  					 struct clock_event_device *evt)
>  {
> @@ -382,8 +376,9 @@ static void __init omap2_gp_clockevent_init(int gptimer_id,
>  				     &clockevent_gpt.name, OMAP_TIMER_POSTED);
>  	BUG_ON(res);
>  
> -	omap2_gp_timer_irq.dev_id = &clkev;
> -	setup_irq(clkev.irq, &omap2_gp_timer_irq);
> +	if (request_irq(clkev.irq, omap2_gp_timer_interrupt,
> +			IRQF_TIMER | IRQF_IRQPOLL, "gp_timer", &clkev))
> +		pr_err("%s: request_irq() failed\n", "gp_timer");
>  
>  	__omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW);
>  
> diff --git a/arch/arm/mach-rpc/time.c b/arch/arm/mach-rpc/time.c
> index 1d750152b160..3b7d3baa8ac1 100644
> --- a/arch/arm/mach-rpc/time.c
> +++ b/arch/arm/mach-rpc/time.c
> @@ -85,11 +85,6 @@ ioc_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction ioc_timer_irq = {
> -	.name		= "timer",
> -	.handler	= ioc_timer_interrupt
> -};
> -
>  /*
>   * Set up timer interrupt.
>   */
> @@ -97,5 +92,6 @@ void __init ioc_timer_init(void)
>  {
>  	WARN_ON(clocksource_register_hz(&ioctime_clocksource, RPC_CLOCK_FREQ));
>  	ioctime_init();
> -	setup_irq(IRQ_TIMER0, &ioc_timer_irq);
> +	if (request_irq(IRQ_TIMER0, ioc_timer_interrupt, 0, "timer", NULL))
> +		pr_err("%s: request_irq() failed\n", "timer");
>  }
> diff --git a/arch/arm/mach-spear/time.c b/arch/arm/mach-spear/time.c
> index 289e036c9c30..b69acc04db4a 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("%s: request_irq() failed\n", "timer");
>  }
>  
>  static const struct of_device_id timer_of_match[] __initconst = {
> diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c
> index ffb93db68e9c..0a1faa95ecff 100644
> --- a/arch/arm/plat-orion/time.c
> +++ b/arch/arm/plat-orion/time.c
> @@ -177,12 +177,6 @@ static irqreturn_t orion_timer_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> -static struct irqaction orion_timer_irq = {
> -	.name		= "orion_tick",
> -	.flags		= IRQF_TIMER,
> -	.handler	= orion_timer_interrupt
> -};
> -
>  void __init
>  orion_time_set_base(void __iomem *_timer_base)
>  {
> @@ -236,7 +230,9 @@ orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask,
>  	/*
>  	 * Setup clockevent timer (interrupt-driven).
>  	 */
> -	setup_irq(irq, &orion_timer_irq);
> +	if (request_irq(irq, orion_timer_interrupt, IRQF_TIMER, "orion_tick",
> +			NULL))
> +		pr_err("%s: request_irq() failed\n", "orion_tick");
>  	orion_clkevt.cpumask = cpumask_of(0);
>  	clockevents_config_and_register(&orion_clkevt, tclk, 1, 0xfffffffe);
>  }
> -- 
> 2.25.1
>