linux-kernel - Re: [RESEND PATCH v2] mfd: twl6030: Fix endianness problem in IRQ handler

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Date:	Mon, 23 Dec 2013 09:20:38 -0800
From:	Joe Perches <joe@...ches.com>
To:	Taras Kondratiuk <taras.kondratiuk@...aro.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, patches@...aro.org,
	linaro-networking@...aro.org, linaro-kernel@...ts.linaro.org,
	Danke Xie <d.xie@....samsung.com>, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2] mfd: twl6030: Fix endianness problem in IRQ
 handler

On Mon, 2013-12-23 at 19:11 +0200, Taras Kondratiuk wrote:
> From: Danke Xie <d.xie@....samsung.com>
> 
> The current TWL 6030 IRQ handler assumes little endianness.
> This change makes it endian-neutral.
[]
> diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
[]
> @@ -196,8 +197,9 @@ static irqreturn_t twl6030_irq_thread(int irq, void *data)
>  	if (sts.bytes[2] & 0x10)
>  		sts.bytes[2] |= 0x08;
>  
> -	for (i = 0; sts.int_sts; sts.int_sts >>= 1, i++)
> -		if (sts.int_sts & 0x1) {
> +	int_sts = le32_to_cpu(sts.int_sts);
> +	for (i = 0; int_sts; int_sts >>= 1, i++)
> +		if (int_sts & 0x1) {
>  			int module_irq =
>  				irq_find_mapping(pdata->irq_domain,
>  						 pdata->irq_mapping_tbl[i]);

instead of the

	for (...) {
		if (foo & 1) {
		

maybe using ffs would be better/faster

	while ((bit = ffs(int_sts))) {

etc...



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