linux-kernel - Re: [PATCH 2/4] mfd: twl6030-irq: add error check when IRQs are masked initially

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Date:	Tue, 23 Jul 2013 19:08:31 +0100
From:	Graeme Gregory <gg@...mlogic.co.uk>
To:	Grygorii Strashko <grygorii.strashko@...com>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Kevin Hilman <khilman@...aro.org>, linux-omap@...r.kernel.org,
	Ruslan Bilovol <ruslan.bilovol@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] mfd: twl6030-irq: add error check when IRQs are masked
 initially

On 23/07/13 17:07, Grygorii Strashko wrote:
> Add a missed check for errors when TWL IRQs are masked
> initially on probe and report an error in case of failure.
>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  drivers/mfd/twl6030-irq.c |   13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
> index b6030d9..790cc28 100644
> --- a/drivers/mfd/twl6030-irq.c
> +++ b/drivers/mfd/twl6030-irq.c
> @@ -313,7 +313,7 @@ int twl6030_init_irq(struct device *dev, int irq_num)
>  	struct			device_node *node = dev->of_node;
>  	int			nr_irqs, irq_base, irq_end;
>  	static struct irq_chip  twl6030_irq_chip;
> -	int			status = 0;
> +	int			status;
>  	int			i;
>  	u8			mask[3];
>  
> @@ -335,11 +335,16 @@ int twl6030_init_irq(struct device *dev, int irq_num)
>  	mask[2] = 0xFF;
>  
>  	/* mask all int lines */
> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
> +	status = twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_LINE_A, 3);
>  	/* mask all int sts */
> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
> +	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_MSK_STS_A, 3);
>  	/* clear INT_STS_A,B,C */
> -	twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
> +	status |= twl_i2c_write(TWL_MODULE_PIH, &mask[0], REG_INT_STS_A, 3);
> +
You can save two i2c writes here for slightly faster initialisation,
only one of the REG_INT_STS_A registers needs to be written to clear
them all. As per the irq handling routine comment.
> +	if (status < 0) {
> +		dev_err(dev, "I2C err writing TWL_MODULE_PIH: %d\n", status);
> +		return status;
> +	}
>  
>  	twl6030_irq_base = irq_base;
>  

Graeme

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