linux-kernel - Re: [PATCH -next] video: fbdev: pxa3xx-gcu: release the resources correctly in pxa3xx_gcu

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Message-ID: <e1d467ab-4ce6-6702-bd96-4ed5f4c6543c@gmx.de>
Date:   Thu, 19 May 2022 11:37:06 +0200
From:   Helge Deller <deller@....de>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org
Subject: Re: [PATCH -next] video: fbdev: pxa3xx-gcu: release the resources
 correctly in pxa3xx_gcu_probe/remove()

On 5/13/22 12:05, Yang Yingliang wrote:
> In pxa3xx_gcu_probe(), the sequence of error lable is wrong, it will
> leads some resource leaked, so adjust the sequence to handle the error
> correctly, and if pxa3xx_gcu_add_buffer() fails, pxa3xx_gcu_free_buffers()
> need be called.
> In pxa3xx_gcu_remove(), add missing clk_disable_unpreprare().
>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>

applied to fbdev tree.

Thanks!
Helge

> ---
>  drivers/video/fbdev/pxa3xx-gcu.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
> index 350b3139c863..043cc8f9ef1c 100644
> --- a/drivers/video/fbdev/pxa3xx-gcu.c
> +++ b/drivers/video/fbdev/pxa3xx-gcu.c
> @@ -646,6 +646,7 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
>  	for (i = 0; i < 8; i++) {
>  		ret = pxa3xx_gcu_add_buffer(dev, priv);
>  		if (ret) {
> +			pxa3xx_gcu_free_buffers(dev, priv);
>  			dev_err(dev, "failed to allocate DMA memory\n");
>  			goto err_disable_clk;
>  		}
> @@ -662,15 +663,15 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
>  			SHARED_SIZE, irq);
>  	return 0;
>
> -err_free_dma:
> -	dma_free_coherent(dev, SHARED_SIZE,
> -			priv->shared, priv->shared_phys);
> +err_disable_clk:
> +	clk_disable_unprepare(priv->clk);
>
>  err_misc_deregister:
>  	misc_deregister(&priv->misc_dev);
>
> -err_disable_clk:
> -	clk_disable_unprepare(priv->clk);
> +err_free_dma:
> +	dma_free_coherent(dev, SHARED_SIZE,
> +			  priv->shared, priv->shared_phys);
>
>  	return ret;
>  }
> @@ -683,6 +684,7 @@ static int pxa3xx_gcu_remove(struct platform_device *pdev)
>  	pxa3xx_gcu_wait_idle(priv);
>  	misc_deregister(&priv->misc_dev);
>  	dma_free_coherent(dev, SHARED_SIZE, priv->shared, priv->shared_phys);
> +	clk_disable_unprepare(priv->clk);
>  	pxa3xx_gcu_free_buffers(dev, priv);
>
>  	return 0;