Re: [PATCH] iio: adc: ad7280a: handle spi_setup() errors in probe()

[Marcelo Schmitt <marcelo.schmitt1@gmail.com>]

On 11/14, Pavel Zhigulin wrote:
> The probe() function ignored the return value of spi_setup(), leaving SPI
> configuration failures undetected. If spi_setup() fails, the driver should
> stop initialization and propagate the error to the caller.
> 
> Add proper error handling: check the return value of spi_setup() and return
> it on failure.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 2051f25d2a26 ("iio: adc: New driver for AD7280A Lithium Ion Battery Monitoring System")
> Signed-off-by: Pavel Zhigulin <Pavel.Zhigulin@kaspersky.com>

Reviewed-by: Marcelo Schmitt <marcelo.schmitt@analog.com>

As patch suggestion, we could also have
  spi-cpha: true
in ad7280a dt-binding.

Thanks,
Marcelo

> ---
>  drivers/iio/adc/ad7280a.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/ad7280a.c b/drivers/iio/adc/ad7280a.c
> index dda2986ccda0..63fceb239bd8 100644
> --- a/drivers/iio/adc/ad7280a.c
> +++ b/drivers/iio/adc/ad7280a.c
> @@ -1024,7 +1024,9 @@ static int ad7280_probe(struct spi_device *spi)
> 
>  	st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ;
>  	st->spi->mode = SPI_MODE_1;
> -	spi_setup(st->spi);
> +	ret = spi_setup(st->spi);
> +	if (ret < 0)
> +		return ret;
> 
>  	st->ctrl_lb = FIELD_PREP(AD7280A_CTRL_LB_ACQ_TIME_MSK, st->acquisition_time) |
>  		FIELD_PREP(AD7280A_CTRL_LB_THERMISTOR_MSK, st->thermistor_term_en);
> --
> 2.43.0
> 
>