linux-kernel - Re: [PATCH] media: mtk-vpu: Fix a resource leak in the error handling path of 'mtk_vpu

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Message-ID: <6cb09965bce5bffe97fc00faecfffae9d3b38b3d.camel@mediatek.com>
Date:   Fri, 20 Aug 2021 07:20:13 +0800
From:   houlong wei <houlong.wei@...iatek.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Minghsiu Tsai (蔡明修) 
        <Minghsiu.Tsai@...iatek.com>,
        Andrew-CT Chen (陳智迪) 
        <Andrew-CT.Chen@...iatek.com>,
        Tiffany Lin (林慧珊) 
        <tiffany.lin@...iatek.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "hans.verkuil@...co.com" <hans.verkuil@...co.com>
CC:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        <houlong.wei@...iatek.com>
Subject: Re: [PATCH] media: mtk-vpu: Fix a resource leak in the error
 handling path of 'mtk_vpu_probe()'

On Fri, 2021-08-20 at 04:21 +0800, Christophe JAILLET wrote:
> A successful 'clk_prepare()' call should be balanced by a
> corresponding
> 'clk_unprepare()' call in the error handling path of the probe, as
> already
> done in the remove function.
> 
> Update the error handling path accordingly.
> 
> Fixes: 3003a180ef6b ("[media] VPU: mediatek: support Mediatek VPU")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> 
Reviewed-by: Houlong Wei <houlong.wei@...iatek.com>

>  drivers/media/platform/mtk-vpu/mtk_vpu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c
> b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> index ec290dde59cf..7f1647da0ade 100644
> --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
> +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
> @@ -848,7 +848,8 @@ static int mtk_vpu_probe(struct platform_device
> *pdev)
>  	vpu->wdt.wq = create_singlethread_workqueue("vpu_wdt");
>  	if (!vpu->wdt.wq) {
>  		dev_err(dev, "initialize wdt workqueue failed\n");
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto clk_unprepare;
>  	}
>  	INIT_WORK(&vpu->wdt.ws, vpu_wdt_reset_func);
>  	mutex_init(&vpu->vpu_mutex);
> @@ -942,6 +943,8 @@ static int mtk_vpu_probe(struct platform_device
> *pdev)
>  	vpu_clock_disable(vpu);
>  workqueue_destroy:
>  	destroy_workqueue(vpu->wdt.wq);
> +clk_unprepare:
> +	clk_unprepare(vpu->clk);
>  
>  	return ret;
>  }
> -- 
> 2.30.2
>