[PATCH 1/3] i2c: gpio: fix handling of return code of of_get_gpio

[Sascha Hauer]

On Wed, Nov 16, 2016 at 01:18:49PM +0100, Uwe Kleine-König wrote:
> Instead of using gpio_is_valid just check the return code of of_get_gpio
> for being < 0. This fixes -EPROBE_DEFER handling as now this error code
> is handed to the caller instead of -ENODEV. If the gpio returned by
> of_get_gpio is an invalid number this isn't noticed by
> of_i2c_gpio_probe, but then gpio_request later fails which is good
> enough.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>

Applied, thanks

Sascha

> ---
>  drivers/i2c/busses/i2c-gpio.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
> index 9362ed181fe3..850db7b2f652 100644
> --- a/drivers/i2c/busses/i2c-gpio.c
> +++ b/drivers/i2c/busses/i2c-gpio.c
> @@ -89,6 +89,7 @@ static int of_i2c_gpio_probe(struct device_node *np,
>  			     struct i2c_gpio_platform_data *pdata)
>  {
>  	u32 reg;
> +	int ret;
>  
>  	if (!IS_ENABLED(CONFIG_OFDEVICE))
>  		return -ENODEV;
> @@ -96,14 +97,15 @@ static int of_i2c_gpio_probe(struct device_node *np,
>  	if (of_gpio_count(np) < 2)
>  		return -ENODEV;
>  
> -	pdata->sda_pin = of_get_gpio(np, 0);
> -	pdata->scl_pin = of_get_gpio(np, 1);
> +	ret = of_get_gpio(np, 0);
> +	if (ret < 0)
> +		return ret;
> +	pdata->sda_pin = ret;
>  
> -	if (!gpio_is_valid(pdata->sda_pin) || !gpio_is_valid(pdata->scl_pin)) {
> -		pr_err("%s: invalid GPIO pins, sda=%d/scl=%d\n",
> -		       np->full_name, pdata->sda_pin, pdata->scl_pin);
> -		return -ENODEV;
> -	}
> +	ret = of_get_gpio(np, 1);
> +	if (ret < 0)
> +		return ret;
> +	pdata->scl_pin = ret;
>  
>  	of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay);
>  
> -- 
> 2.10.2
> 
> 
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