linux-kernel - Re: [PATCH] drm/msm/dsi: Fix missing put_device() call in dsi_get

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Message-ID: <5db5b998-9563-be71-e87f-d906bf8b438b@linaro.org>
Date:   Thu, 20 Jan 2022 02:16:22 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Hai Li <hali@...eaurora.org>, 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: Fix missing put_device() call in dsi_get_phy

On 30/12/2021 10:09, Miaoqian Lin wrote:
> If of_find_device_by_node() succeeds, dsi_get_phy() doesn't
> a corresponding put_device(). Thus add put_device() to fix the exception
> handling.
> 
> Fixes: ec31abf ("drm/msm/dsi: Separate PHY to another platform device")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/dsi/dsi.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
> index 75ae3008b68f..35be526e907a 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi.c
> @@ -40,7 +40,12 @@ static int dsi_get_phy(struct msm_dsi *msm_dsi)
>   
>   	of_node_put(phy_node);
>   
> -	if (!phy_pdev || !msm_dsi->phy) {
> +	if (!phy_pdev) {
> +		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
> +		return -EPROBE_DEFER;
> +	}
> +	if (!msm_dsi->phy) {
> +		put_device(&phy_pdev->dev);
>   		DRM_DEV_ERROR(&pdev->dev, "%s: phy driver is not ready\n", __func__);
>   		return -EPROBE_DEFER;
>   	}


-- 
With best wishes
Dmitry