linux-kernel - Re: [PATCH] drm/msm/dsi: add missing put

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Date:   Tue, 18 Jul 2023 11:15:56 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     sunran001@...suo.com, robdclark@...il.com,
        quic_abhinavk@...cinc.com, airlied@...il.com, daniel@...ll.ch
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dsi: add missing put_device()

On 18/07/2023 11:13, sunran001@...suo.com wrote:
> The of_find_device_by_node() takes a reference to the underlying device
> structure, we should release that reference.
> 
> Detected by coccinelle with the following ERROR:
> ./drivers/gpu/drm/msm/dsi/dsi.c:50:1-7: ERROR: missing put_device; call
> of_find_device_by_node on line 32, but without a corresponding object
> release within this function.
> 
> Signed-off-by: Ran Sun <sunran001@...suo.com>
> ---
>   drivers/gpu/drm/msm/dsi/dsi.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
> index baab79ab6e74..81461e8852a7 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi.c
> @@ -46,7 +46,7 @@ static int dsi_get_phy(struct msm_dsi *msm_dsi)
>           DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", 
> __func__);
>           return -EPROBE_DEFER;
>       }
> -
> +    put_device(&pdev->dev);

NAK. First, you are putting pdev instead of phy_pdev. Next, the 
reference to the phy dev is correctly stored and then put in 
dsi_destroy(). Please do not make blind patches when reviewing static 
analyser warnings.

>       return 0;
>   }

-- 
With best wishes
Dmitry