Re: [PATCH net-next v5] net: ti: icssg_prueth: add TAPRIO offload support

[Paolo Abeni <pabeni@redhat.com>]

On Mon, 2024-04-29 at 16:00 +0530, MD Danish Anwar wrote:
> +static int emac_taprio_replace(struct net_device *ndev,
> +			       struct tc_taprio_qopt_offload *taprio)
> +{
> +	struct prueth_emac *emac = netdev_priv(ndev);
> +	struct tc_taprio_qopt_offload *est_new;
> +	int ret;
> +
> +	if (taprio->cycle_time_extension) {
> +		NL_SET_ERR_MSG_MOD(taprio->extack, "Cycle time extension not supported");
> +		return -EOPNOTSUPP;
> +	}
> +
> +	if (taprio->cycle_time < TAS_MIN_CYCLE_TIME) {
> +		NL_SET_ERR_MSG_FMT_MOD(taprio->extack, "cycle_time %llu is less than min supported cycle_time %d",
> +				       taprio->cycle_time, TAS_MIN_CYCLE_TIME);
> +		return -EINVAL;
> +	}
> +
> +	if (taprio->num_entries > TAS_MAX_CMD_LISTS) {
> +		NL_SET_ERR_MSG_FMT_MOD(taprio->extack, "num_entries %lu is more than max supported entries %d",
> +				       taprio->num_entries, TAS_MAX_CMD_LISTS);
> +		return -EINVAL;
> +	}
> +
> +	if (emac->qos.tas.taprio_admin)
> +		devm_kfree(&ndev->dev, emac->qos.tas.taprio_admin);

it looks like 'qos.tas.taprio_admin' is initialized from
taprio_offload_get(), so it should be free with taprio_offload_free(),
right?

> +
> +	est_new = devm_kzalloc(&ndev->dev,
> +			       struct_size(est_new, entries, taprio->num_entries),
> +			       GFP_KERNEL);
> +	if (!est_new)
> +		return -ENOMEM;

Why are you allocating 'est_new'? it looks like it's not used
anywhere?!? 

> +
> +	emac->qos.tas.taprio_admin = taprio_offload_get(taprio);
> +	ret = tas_update_oper_list(emac);
> +	if (ret)
> +		return ret;

Should the above clear 'taprio_admin' on error, as well? 

> 
Thanks,

Paolo