linux-kernel - Re: [PATCH v2 3/3] soc: aspeed: lpc-pcc: Add PCC controller support

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Message-ID: <7ef88ec2-24a5-4aa7-a601-d605a12768ba@wanadoo.fr>
Date: Tue, 4 Mar 2025 22:20:59 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Kevin Chen <kevin_chen@...eedtech.com>, lee@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, joel@....id.au,
 andrew@...econstruct.com.au, derek.kiernan@....com, dragan.cvetic@....com,
 arnd@...db.de, gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] soc: aspeed: lpc-pcc: Add PCC controller support

Le 04/03/2025 à 11:44, Kevin Chen a écrit :
> Add LPC PCC controller driver to support POST code capture.
> 
> Signed-off-by: Kevin Chen <kevin_chen@...eedtech.com>

Hi,

> +	init_waitqueue_head(&pcc->wq);
> +
> +	pcc->mdev_id = ida_alloc(&aspeed_pcc_ida, GFP_KERNEL);

Missing ida_free() in therror handling path and in the rmove function?

> +	if (pcc->mdev_id < 0) {
> +		dev_err(dev, "Couldn't allocate ID\n");
> +		return pcc->mdev_id;
> +	}
> +
> +	pcc->mdev.parent = dev;
> +	pcc->mdev.minor = MISC_DYNAMIC_MINOR;
> +	pcc->mdev.name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME,
> +					pcc->mdev_id);
> +	pcc->mdev.fops = &pcc_fops;
> +	rc = misc_register(&pcc->mdev);
> +	if (rc) {
> +		dev_err(dev, "Couldn't register misc device\n");
> +		goto err_free_kfifo;
> +	}
> +
> +	rc = aspeed_pcc_enable(pcc, dev);
> +	if (rc) {
> +		dev_err(dev, "Couldn't enable PCC\n");
> +		goto err_dereg_mdev;
> +	}
> +
> +	dev_set_drvdata(&pdev->dev, pcc);
> +
> +	return 0;
> +
> +err_dereg_mdev:
> +	misc_deregister(&pcc->mdev);
> +
> +err_free_kfifo:
> +	kfifo_free(&pcc->fifo);
> +
> +	return rc;
> +}
> +
> +static void aspeed_pcc_remove(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct aspeed_pcc_ctrl *pcc = dev_get_drvdata(dev);
> +
> +	kfifo_free(&pcc->fifo);
> +	misc_deregister(&pcc->mdev);
> +}
> +
> +static const struct of_device_id aspeed_pcc_table[] = {
> +	{ .compatible = "aspeed,ast2600-lpc-pcc" },
> +	{ },

Unneeded trailing comma after a terminator.

> +};
> +
> +static struct platform_driver aspeed_pcc_driver = {
> +	.driver = {
> +		.name = "aspeed-pcc",
> +		.of_match_table = aspeed_pcc_table,
> +	},
> +	.probe = aspeed_pcc_probe,
> +	.remove = aspeed_pcc_remove,
> +};

...

CJ