linux-kernel - Re: [PATCH 2/2] thermal/drivers/mediatek/lvts

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Date: Mon, 8 Apr 2024 11:09:51 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 2/2] thermal/drivers/mediatek/lvts_thermal: Improve some
 memory allocation

On Sun, Apr 07, 2024 at 10:01:49PM +0200, Christophe JAILLET wrote:
> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
> index 3003dc350766..b133f731c5ba 100644
> --- a/drivers/thermal/mediatek/lvts_thermal.c
> +++ b/drivers/thermal/mediatek/lvts_thermal.c
> @@ -204,7 +204,7 @@ static const struct debugfs_reg32 lvts_regs[] = {
>  
>  static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td)
>  {
> -	struct debugfs_regset32 *regset;
> +	struct debugfs_regset32 *regsets;
>  	struct lvts_ctrl *lvts_ctrl;
>  	struct dentry *dentry;
>  	char name[64];
> @@ -214,8 +214,14 @@ static int lvts_debugfs_init(struct device *dev, struct lvts_domain *lvts_td)
>  	if (IS_ERR(lvts_td->dom_dentry))
>  		return 0;
>  
> +	regsets = devm_kcalloc(dev, lvts_td->num_lvts_ctrl,
> +			       sizeof(*regsets), GFP_KERNEL);
> +	if (!regsets)
> +		return 0;

I understand that this preserved the behavior from the original code,
but the original code was wrong.  This should return -ENOMEM.

> +
>  	for (i = 0; i < lvts_td->num_lvts_ctrl; i++) {
>  
> +		struct debugfs_regset32 *regset = &regsets[i];
>  		lvts_ctrl = &lvts_td->lvts_ctrl[i];

The blank line should come after the declaration.

regards,
dan carpenter