linux-kernel - Re: [PATCH] dma/mediatek-hs/probe: Fixed a memory leak when devm_request

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Message-ID: <20191105165914.GD952516@vkoul-mobl>
Date:   Tue, 5 Nov 2019 22:29:14 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Satendra Singh Thakur <sst2005@...il.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma/mediatek-hs/probe: Fixed a memory leak when
 devm_request_irq fails

On 24-10-19, 10:13, Satendra Singh Thakur wrote:
> When devm_request_irq fails, currently, the function
> dma_async_device_unregister gets called. This doesn't free
> the resources allocated by of_dma_controller_register.
> Therefore, we have called of_dma_controller_free for this purpose.

Please revise this one as well!

> 
> Signed-off-by: Satendra Singh Thakur <sst2005@...il.com>
> ---
>  drivers/dma/mediatek/mtk-hsdma.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/mediatek/mtk-hsdma.c b/drivers/dma/mediatek/mtk-hsdma.c
> index 1a2028e1c29e..4c58da742143 100644
> --- a/drivers/dma/mediatek/mtk-hsdma.c
> +++ b/drivers/dma/mediatek/mtk-hsdma.c
> @@ -997,7 +997,7 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
>  	if (err) {
>  		dev_err(&pdev->dev,
>  			"request_irq failed with err %d\n", err);
> -		goto err_unregister;
> +		goto err_free;
>  	}
>  
>  	platform_set_drvdata(pdev, hsdma);
> @@ -1006,6 +1006,8 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> +err_free:
> +	of_dma_controller_free(pdev->dev.of_node);
>  err_unregister:
>  	dma_async_device_unregister(dd);
>  
> -- 
> 2.17.1

-- 
~Vinod