linux-kernel - Re: [RESEND PATCH v1 5/6] staging: greybus: audio: Add helper APIs for dynamic audio modules

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Date:   Tue, 2 Jun 2020 15:44:39 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Vaibhav Agarwal <vaibhav.sr@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Elder <elder@...nel.org>, Johan Hovold <johan@...nel.org>,
        Mark Greer <mgreer@...malcreek.com>,
        Takashi Iwai <tiwai@...e.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        devel@...verdev.osuosl.org, alsa-devel@...a-project.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-kernel@...r.kernel.org, greybus-dev@...ts.linaro.org
Subject: Re: [RESEND PATCH v1 5/6] staging: greybus: audio: Add helper APIs
 for dynamic audio modules

On Tue, Jun 02, 2020 at 10:51:14AM +0530, Vaibhav Agarwal wrote:
> +static int gbaudio_remove_controls(struct snd_card *card, struct device *dev,
> +				   const struct snd_kcontrol_new *controls,
> +				   int num_controls, const char *prefix)
> +{
> +	int i, err;
> +
> +	for (i = 0; i < num_controls; i++) {
> +		const struct snd_kcontrol_new *control = &controls[i];
> +		struct snd_ctl_elem_id id;
> +		struct snd_kcontrol *kctl;
> +
> +		if (prefix)
> +			snprintf(id.name, sizeof(id.name), "%s %s", prefix,
> +				 control->name);
> +		else
> +			strlcpy(id.name, control->name, sizeof(id.name));
> +		id.numid = 0;
> +		id.iface = control->iface;
> +		id.device = control->device;
> +		id.subdevice = control->subdevice;
> +		id.index = control->index;
> +		kctl = snd_ctl_find_id(card, &id);
> +		if (!kctl) {
> +			dev_err(dev, "%d: Failed to find %s\n", err,
> +				control->name);
> +			return -ENOENT;

I feel like this should be a continue instead of a return.

> +		}
> +		err = snd_ctl_remove(card, kctl);
> +		if (err < 0) {
> +			dev_err(dev, "%d: Failed to remove %s\n", err,
> +				control->name);
> +			return err;

Probably here as well.  The caller doesn't actually check for errors.

> +		}
> +	}
> +	return 0;
> +}