linux-kernel - Re: [PATCH] iio: imu: adis: assign value only if return code zero in read funcs

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Date:   Fri, 1 Nov 2019 09:25:36 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
CC:     "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>
Subject: Re: [PATCH] iio: imu: adis: assign value only if return code zero in
 read funcs

On Wed, 2019-10-30 at 13:55 +0200, Alexandru Ardelean wrote:
> The inline read functions in the ADIS library don't check the return
> value
> of the `adis_read_reg()` function and assign the value of `tmp`
> regardless.
> 
> Fix this by checking if return value is zero and only then assigning the
> value of `tmp`.
> 

@Jonathan:
Please disregard this.
I will re-spin this as a series.
It turned out that the whole thing/changeset is much bigger than I
initially anticipated.

I think I found the reason why we (at ADI) weren't catching the ADIS
warnings/errors, before upstreaming.
It turns out, that we were only testing with ARM & ARM64 compilers, while
the compilers that were hitting us with warnings are x86_64. I do remember
[from past experiences] that different GCC compilers report different
[often valid] types of errors. But, if I don't need to work with too many
ARCHs, I do forget about this aspect.

In any case, I've updated our CI to also include a build-run with x86_64
for all ADI drivers.
And we may also extend this to cover the entire kernel [later].

Thanks
Alex

> Fixes: 57a1228a06b7a ("iio:imu:adis: Add support for 32bit registers")
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
>  include/linux/iio/imu/adis.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
> index 4c53815bb729..92aae14593bf 100644
> --- a/include/linux/iio/imu/adis.h
> +++ b/include/linux/iio/imu/adis.h
> @@ -129,7 +129,8 @@ static inline int adis_read_reg_16(struct adis *adis,
> unsigned int reg,
>  	int ret;
>  
>  	ret = adis_read_reg(adis, reg, &tmp, 2);
> -	*val = tmp;
> +	if (ret == 0)
> +		*val = tmp;
>  
>  	return ret;
>  }
> @@ -147,7 +148,8 @@ static inline int adis_read_reg_32(struct adis *adis,
> unsigned int reg,
>  	int ret;
>  
>  	ret = adis_read_reg(adis, reg, &tmp, 4);
> -	*val = tmp;
> +	if (ret == 0)
> +		*val = tmp;
>  
>  	return ret;
>  }