linux-kernel - Re: [PATCH] firmware: mediatek: add adsp ipc protocol interface

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Date:   Tue, 11 Jan 2022 11:02:03 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "allen-kh.cheng" <allen-kh.cheng@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Linux-ALSA <alsa-devel@...a-project.org>, tzungbi@...gle.com,
        cujomalainey@...gle.com, Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        sound-open-firmware@...a-project.org
Subject: Re: [PATCH] firmware: mediatek: add adsp ipc protocol interface


> +int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
> +{
> +	struct mtk_adsp_chan *dsp_chan;
> +	int ret;
> +
> +	if (idx >= MTK_ADSP_MBOX_NUM)
> +		return -EINVAL;
> +
> +	dsp_chan = &ipc->chans[idx];
> +	ret = mbox_send_message(dsp_chan->ch, &msg);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;

this can be simplified a bit without the 'ret' variable

return mbox_send_message(dsp_chan->ch, &msg);

> +}
> +EXPORT_SYMBOL(mtk_adsp_ipc_send);


> +static int mtk_adsp_ipc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct mtk_adsp_ipc *dsp_ipc;
> +	struct mtk_adsp_chan *dsp_chan;
> +	struct mbox_client *cl;
> +	char *chan_name;
> +	int ret;
> +	int i, j;
> +
> +	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
> +
> +	dsp_ipc = devm_kzalloc(dev, sizeof(*dsp_ipc), GFP_KERNEL);
> +	if (!dsp_ipc)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
> +		chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
> +		if (!chan_name) {
> +			ret = -ENOMEM;
> +			goto out;
> +		}

in this case with the existing code you will free something that was not
allocated. It's not super elegant, consider using different labels as
suggested below.

> +
> +		dsp_chan = &dsp_ipc->chans[i];
> +		cl = &dsp_chan->cl;
> +		cl->dev = dev->parent;
> +		cl->tx_block = false;
> +		cl->knows_txdone = false;
> +		cl->tx_prepare = NULL;
> +		cl->rx_callback = mtk_adsp_ipc_recv;
> +
> +		dsp_chan->ipc = dsp_ipc;
> +		dsp_chan->idx = i;
> +		dsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
> +		if (IS_ERR(dsp_chan->ch)) {
> +			ret = PTR_ERR(dsp_chan->ch);
> +			if (ret != -EPROBE_DEFER)
> +				dev_err(dev, "Failed to request mbox chan %d ret %d\n",
> +					i, ret);
> +			goto out;

goto out_free;

> +		}
> +
> +		dev_dbg(dev, "request mbox chan %s\n", chan_name);
> +		kfree(chan_name);
> +	}
> +
> +	dsp_ipc->dev = dev;
> +	dev_set_drvdata(dev, dsp_ipc);
> +	dev_dbg(dev, "MTK ADSP IPC initialized\n");
> +
> +	return 0;
> +
> +out:

out_free:
> +	kfree(chan_name);

out:

> +	for (j = 0; j < i; j++) {
> +		dsp_chan = &dsp_ipc->chans[j];
> +		mbox_free_channel(dsp_chan->ch);
> +	}
> +
> +	return ret;
> +}
> +
> +static int mtk_adsp_ipc_remove(struct platform_device *pdev)
> +{
> +	struct mtk_adsp_ipc *dsp_ipc = dev_get_drvdata(&pdev->dev);
> +	struct mtk_adsp_chan *dsp_chan;
> +	int i;
> +
> +	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
> +		dsp_chan = &dsp_ipc->chans[i];
> +		mbox_free_channel(dsp_chan->ch);
> +	}
> +
> +	return 0;
> +}
> +
> +static struct platform_driver mtk_adsp_ipc_driver = {
> +	.driver = {
> +		.name = "mtk-adsp-ipc",
> +	},
> +	.probe = mtk_adsp_ipc_probe,
> +	.remove = mtk_adsp_ipc_remove,
> +};
> +builtin_platform_driver(mtk_adsp_ipc_driver);
> +
> +MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@...iatek.com>");
> +MODULE_DESCRIPTION("MTK ADSP IPC Driver");
> +MODULE_LICENSE("GPL v2");

the v2 here isn't useful, the license information can be found in the
SPDX line.

MODULE_LICENSE("GPL");