linux-kernel - Re: [PATCH 17/18] irqchip: Replace setup_irq() by request

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Message-Id: <1581609764.3.2@crapouillou.net>
Date:   Thu, 13 Feb 2020 13:02:44 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     afzal mohammed <afzal.mohd.ma@...il.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 17/18] irqchip: Replace setup_irq() by request_irq()

Hi,


Le mer., févr. 12, 2020 at 13:35, afzal mohammed 
<afzal.mohd.ma@...il.com> a écrit :
> request_irq() is preferred over setup_irq(). Existing callers of
> setup_irq() reached mostly via 'init_IRQ()' & '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 wherever that has been found, it too has been replaced by free_irq().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@...il.com>

Reviewed-by: Paul Cercueil <paul@...pouillou.net>

> ---
> 
> Since cc'ing cover letter to all maintainers/reviewers would be too
> many, refer for cover letter,
>  
> https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com
> 
>  drivers/irqchip/irq-i8259.c   |  9 +++------
>  drivers/irqchip/irq-ingenic.c | 11 +++++------
>  2 files changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
> index d000870d9b6b..e9798d02b256 100644
> --- a/drivers/irqchip/irq-i8259.c
> +++ b/drivers/irqchip/irq-i8259.c
> @@ -271,11 +271,6 @@ static void init_8259A(int auto_eoi)
>  /*
>   * IRQ2 is cascade interrupt to second interrupt controller
>   */
> -static struct irqaction irq2 = {
> -	.handler = no_action,
> -	.name = "cascade",
> -	.flags = IRQF_NO_THREAD,
> -};
> 
>  static struct resource pic1_io_resource = {
>  	.name = "pic1",
> @@ -323,7 +318,9 @@ struct irq_domain * __init 
> __init_i8259_irqs(struct device_node *node)
>  	if (!domain)
>  		panic("Failed to add i8259 IRQ domain");
> 
> -	setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
> +	if (request_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, no_action,
> +			IRQF_NO_THREAD, "cascade", NULL))
> +		pr_err("request_irq() on %s failed\n", "cascade");
>  	register_syscore_ops(&i8259_syscore_ops);
>  	return domain;
>  }
> diff --git a/drivers/irqchip/irq-ingenic.c 
> b/drivers/irqchip/irq-ingenic.c
> index c5589ee0dfb3..5b20a0f0ece8 100644
> --- a/drivers/irqchip/irq-ingenic.c
> +++ b/drivers/irqchip/irq-ingenic.c
> @@ -58,11 +58,6 @@ static irqreturn_t intc_cascade(int irq, void 
> *data)
>  	return IRQ_HANDLED;
>  }
> 
> -static struct irqaction intc_cascade_action = {
> -	.handler = intc_cascade,
> -	.name = "SoC intc cascade interrupt",
> -};
> -
>  static int __init ingenic_intc_of_init(struct device_node *node,
>  				       unsigned num_chips)
>  {
> @@ -130,7 +125,11 @@ static int __init ingenic_intc_of_init(struct 
> device_node *node,
>  		irq_reg_writel(gc, IRQ_MSK(32), JZ_REG_INTC_SET_MASK);
>  	}
> 
> -	setup_irq(parent_irq, &intc_cascade_action);
> +	if (request_irq(parent_irq, intc_cascade, 0,
> +			"SoC intc cascade interrupt", NULL)) {
> +		pr_err("request_irq() on %s failed\n",
> +		       "SoC intc cascade interrupt");
> +	}
>  	return 0;
> 
>  out_domain_remove:
> --
> 2.24.1
>