Re: [PATCH 2/2] drm: zynqmp_dp: Use scope-based mutex helpers

[Bart Van Assche <bvanassche@acm.org>]

On 2/6/25 11:41 AM, Sean Anderson wrote:
>   static int zynqmp_dp_enhanced_set(void *data, u64 val)
>   {
>   	struct zynqmp_dp *dp = data;
> -	int ret = 0;
>   
> -	mutex_lock(&dp->lock);
> +	guard(mutex)(&dp->lock);
>   	dp->test.enhanced = val;
>   	if (dp->test.active)
> -		ret = zynqmp_dp_test_setup(dp);
> -	mutex_unlock(&dp->lock);
> +		return zynqmp_dp_test_setup(dp);
>   
> -	return ret;
> +	return 0;
>   }

Has it been considered to combine the two return statements into one
with the ternary operator (?:)?

>   static int zynqmp_dp_downspread_set(void *data, u64 val)
>   {
>   	struct zynqmp_dp *dp = data;
> -	int ret = 0;
>   
> -	mutex_lock(&dp->lock);
> +	guard(mutex)(&dp->lock);
>   	dp->test.downspread = val;
>   	if (dp->test.active)
> -		ret = zynqmp_dp_test_setup(dp);
> -	mutex_unlock(&dp->lock);
> +		return zynqmp_dp_test_setup(dp);
>   
> -	return ret;
> +	return 0;
>   }

Same question here.

> @@ -2053,7 +2039,8 @@ static ssize_t zynqmp_dp_custom_read(struct file *file, char __user *user_buf,
>   		return ret;
>   
>   	mutex_lock(&dp->lock);
> -	ret = simple_read_from_buffer(user_buf, count, ppos, &dp->test.custom,
> +	ret = simple_read_from_buffer(user_buf, count, ppos,
> +				      &dp->test.custom,
>   				      sizeof(dp->test.custom));

This change has not been mentioned in the patch description and is not
related to the other changes in this patch?

> -	return ret;
> +	dp->test.link_cnt = val;
> +	if (dp->test.active)
> +		return zynqmp_dp_test_setup(dp);
> +
> +	return 0;
>   }

Has it been considered to use the ternary operator here?

Thanks,

Bart.