linux-kernel - Re: [PATCH] drm: rcar-du: fix reference leak in rcar_cmm

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Message-ID: <20201215113845.zy4keqwnk3kgw2z2@uno.localdomain>
Date:   Tue, 15 Dec 2020 12:38:45 +0100
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Qinglang Miao <miaoqinglang@...wei.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: rcar-du: fix reference leak in rcar_cmm_enable

Hello Qinglang,

On Fri, Nov 27, 2020 at 05:44:44PM +0800, Qinglang Miao wrote:
> pm_runtime_get_sync will increment pm usage counter even it
> failed. Forgetting to putting operation will result in a
> reference leak here.
>
> A new function pm_runtime_resume_and_get is introduced in
> [0] to keep usage counter balanced. So We fix the reference
> leak by replacing it with new funtion.
>
> [0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

I -think- you can break this line. Anyway, maintainers can fix when
applying if they feel to.

>
> Fixes: e08e934d6c28 ("drm: rcar-du: Add support for CMM")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>

Seems fair!
Acked-by: Jacopo Mondi <jacopo@...ndi.org>

Thanks
  j

> ---
>  drivers/gpu/drm/rcar-du/rcar_cmm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> index c578095b0..382d53f8a 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_cmm.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
> @@ -122,7 +122,7 @@ int rcar_cmm_enable(struct platform_device *pdev)
>  {
>  	int ret;
>
> -	ret = pm_runtime_get_sync(&pdev->dev);
> +	ret = pm_runtime_resume_and_get(&pdev->dev);
>  	if (ret < 0)
>  		return ret;
>
> --
> 2.23.0
>