> +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@xxxxxxxxxxxx>");
> +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");
