Re: [PATCH v5 3/5] iio: ssp_sensors: factor out pending list add/remove helpers

[Andy Shevchenko]

On Mon, Apr 06, 2026 at 01:38:50PM +0530, Sanjay Chitroda wrote:

> The SSP SPI transfer path manipulates the pending message list in
> multiple places, each time open-coding the same locking and list
> operations.
> 
> Re-factor the pending list add and delete logic into small helper
> functions to avoid duplication and simplify transfer flow to follow.
> 
> No functional change intended.

Suggested-by?

...

> +static inline void ssp_pending_add(struct ssp_data *data,
> +				   struct ssp_msg *msg)

Make it rather:

static inline void ssp_pending_add(struct ssp_data *data, struct ssp_msg *msg)
{
	if (msg->length)
		return;
	...
}

> +{
> +	mutex_lock(&data->pending_lock);
> +	list_add_tail(&msg->list, &data->pending_list);
> +	mutex_unlock(&data->pending_lock);
> +}
> +
> +static inline void ssp_pending_del(struct ssp_data *data,
> +				   struct ssp_msg *msg)
> +{
> +	mutex_lock(&data->pending_lock);
> +	list_del(&msg->list);
> +	mutex_unlock(&data->pending_lock);
> +}

(in the same manner)

...

> -	if (!use_no_irq) {
> -		mutex_lock(&data->pending_lock);
> -		list_add_tail(&msg->list, &data->pending_list);
> -		mutex_unlock(&data->pending_lock);
> -	}
> +	if (!use_no_irq)
> +		ssp_pending_add(data, msg);

...and then it will become

	ssp_pending_add(data, msg);

>  	status = ssp_check_lines(data, true);
>  	if (status < 0) {
> -		if (!use_no_irq) {
> -			mutex_lock(&data->pending_lock);
> -			list_del(&msg->list);
> -			mutex_unlock(&data->pending_lock);
> -		}
> +		if (!use_no_irq)
> +			ssp_pending_del(data, msg);
>  		goto _error_locked;
>  	}

...

>  		if (wait_for_completion_timeout(done,
>  						msecs_to_jiffies(timeout)) ==
>  		    0) {
> -			mutex_lock(&data->pending_lock);
> -			list_del(&msg->list);
> -			mutex_unlock(&data->pending_lock);
> +			ssp_pending_del(data, msg);
>  
>  			data->timeout_cnt++;
>  			return -ETIMEDOUT;

Also rewrite this to follow the style (missing {}, better indentation):

	if (msg->length && done &&
	    !wait_for_completion_timeout(done, msecs_to_jiffies(timeout))) {
		ssp_pending_del(data, msg);

		data->timeout_cnt++;
		return -ETIMEDOUT;
	}

And kill that use_no_urq altogether. Move the comment rather to a helper(s).

-- 
With Best Regards,
Andy Shevchenko