Re: [PATCH v5 4/4] pinctrl: Implementation of the generic scmi-pinctrl driver

[Dan Carpenter <dan.carpenter@linaro.org>]

On Thu, Mar 14, 2024 at 09:35:21PM +0800, Peng Fan (OSS) wrote:
> +static int pinctrl_scmi_get_function_groups(struct pinctrl_dev *pctldev,
> +					    unsigned int selector,
> +					    const char * const **groups,
> +					    unsigned int * const num_groups)
> +{
> +	const unsigned int *group_ids;
> +	int ret, i;
> +	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
> +
> +	if (!groups || !num_groups)
> +		return -EINVAL;
> +
> +	if (selector < pmx->nr_functions &&
> +	    pmx->functions[selector].num_groups) {

If pmx->functions[selector].num_groups is set then we assume that
functions[selector].groups has been allocated.

> +		*groups = (const char * const *)pmx->functions[selector].groups;
> +		*num_groups = pmx->functions[selector].num_groups;
> +		return 0;
> +	}
> +
> +	ret = pinctrl_ops->function_groups_get(pmx->ph, selector,
> +					       &pmx->functions[selector].num_groups,
> +					       &group_ids);

However, pmx->functions[selector].num_groups is set here and not cleared
on the error paths.  Or instead of clearing the .num_groups it would be
nice to pass a local variable and only do the
pmx->functions[selector].num_groups = local assignment right before the
success return.

regards,
dan carpenter

> +	if (ret) {
> +		dev_err(pmx->dev, "Unable to get function groups, err %d", ret);
> +		return ret;
> +	}
> +
> +	*num_groups = pmx->functions[selector].num_groups;
> +	if (!*num_groups)
> +		return -EINVAL;
> +
> +	pmx->functions[selector].groups =
> +		devm_kcalloc(pmx->dev, *num_groups,
> +			     sizeof(*pmx->functions[selector].groups),
> +			     GFP_KERNEL);
> +	if (!pmx->functions[selector].groups)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < *num_groups; i++) {
> +		pmx->functions[selector].groups[i] =
> +			pinctrl_scmi_get_group_name(pmx->pctldev,
> +						    group_ids[i]);
> +		if (!pmx->functions[selector].groups[i]) {
> +			ret = -ENOMEM;
> +			goto err_free;
> +		}
> +	}
> +
> +	*groups = (const char * const *)pmx->functions[selector].groups;
> +
> +	return 0;
> +
> +err_free:
> +	devm_kfree(pmx->dev, pmx->functions[selector].groups);
> +
> +	return ret;
> +}