linux-kernel - Re: [PATCH][next] dmaengine: hisilicon: Use struct_size() in devm

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Message-ID: <5EF0407D.2050007@hisilicon.com>
Date:   Mon, 22 Jun 2020 13:24:13 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] dmaengine: hisilicon: Use struct_size() in
 devm_kzalloc()

On 2020/6/18 5:11, Gustavo A. R. Silva wrote:
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> This code was detected with the help of Coccinelle and, audited and
> fixed manually.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Looks good to me, thanks!

Reviewed-by: Zhou Wang <wangzhou1@...ilicon.com>

> ---
>  drivers/dma/hisi_dma.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/dma/hisi_dma.c b/drivers/dma/hisi_dma.c
> index ed3619266a48..e1a958ae7925 100644
> --- a/drivers/dma/hisi_dma.c
> +++ b/drivers/dma/hisi_dma.c
> @@ -511,7 +511,6 @@ static int hisi_dma_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	struct device *dev = &pdev->dev;
>  	struct hisi_dma_dev *hdma_dev;
>  	struct dma_device *dma_dev;
> -	size_t dev_size;
>  	int ret;
>  
>  	ret = pcim_enable_device(pdev);
> @@ -534,9 +533,7 @@ static int hisi_dma_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	if (ret)
>  		return ret;
>  
> -	dev_size = sizeof(struct hisi_dma_chan) * HISI_DMA_CHAN_NUM +
> -		   sizeof(*hdma_dev);
> -	hdma_dev = devm_kzalloc(dev, dev_size, GFP_KERNEL);
> +	hdma_dev = devm_kzalloc(dev, struct_size(hdma_dev, chan, HISI_DMA_CHAN_NUM), GFP_KERNEL);
>  	if (!hdma_dev)
>  		return -EINVAL;
>  
>