linux-kernel - Re: [PATCH 05/10] mfd: menelaus: Use for_each_set

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Date:	Mon, 16 Dec 2013 16:17:35 -0800
From:	Joe Perches <joe@...ches.com>
To:	Felipe Balbi <balbi@...com>
Cc:	lee.jones@...aro.org, Tony Lindgren <tony@...mide.com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH 05/10] mfd: menelaus: Use for_each_set_bit()

On Mon, 2013-12-16 at 18:08 -0600, Felipe Balbi wrote:
> That macro just helps removing some extra line of code and hides ffs()
> calls.
> 
> While at that, also fix a variable shadowing bug where 'int irq' was
> being redeclared inside inner loop while it was also argument to
> interrupt handler.
> 
> Tested-by: Aaro Koskinen <aaro.koskinen@....fi>
> Signed-off-by: Felipe Balbi <balbi@...com>
> ---
>  drivers/mfd/menelaus.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mfd/menelaus.c b/drivers/mfd/menelaus.c
> index 87d80a8..d3e3022 100644
> --- a/drivers/mfd/menelaus.c
> +++ b/drivers/mfd/menelaus.c
> @@ -795,24 +795,22 @@ static irqreturn_t menelaus_irq(int irq, void *_menelaus)
>  {
>  	struct menelaus_chip *menelaus = _menelaus;
>  	void (*handler)(struct menelaus_chip *menelaus);
> -	unsigned isr;
> +	unsigned long isr;
> +	unsigned long i;
>  
>  	isr = (menelaus_read_reg(MENELAUS_INT_STATUS2)
>  			& ~menelaus->mask2) << 8;
>  	isr |= menelaus_read_reg(MENELAUS_INT_STATUS1)
>  		& ~menelaus->mask1;
>  
> -	while (isr) {
> -		int irq = fls(isr) - 1;
> -		isr &= ~(1 << irq);
> -
> +	for_each_set_bit(i, &isr, 16) {
>  		mutex_lock(&menelaus->lock);
> -		menelaus_disable_irq(irq);
> -		menelaus_ack_irq(irq);
> -		handler = menelaus->handlers[irq];
> +		menelaus_disable_irq(i);
> +		menelaus_ack_irq(i);
> +		handler = menelaus->handlers[i];
>  		if (handler)
>  			handler(menelaus);
> -		menelaus_enable_irq(irq);
> +		menelaus_enable_irq(i);
>  		mutex_unlock(&menelaus->lock);
>  	}
>  

This could handle the irqs in reverse order.
Does that matter?

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