linux-kernel - Re: [PATCH] drm/rockchip: cdn-dp: Fix error handling

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Date:   Mon, 20 Feb 2017 09:40:24 +0800
From:   Mark yao <mark.yao@...k-chips.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        airlied@...ux.ie, heiko@...ech.de
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: cdn-dp: Fix error handling

On 2017年02月20日 00:59, Christophe JAILLET wrote:
> It is likely that both 'clk_disable_unprepare()' should be called if
> 'pm_runtime_get_sync()' fails.
>
> Add a new label for that, because 'err_set_rate' is not meaningful in this
> case.
>
>
> Fixes: 1a0f7ed3abe2 ("drm/rockchip: cdn-dp: add cdn DP support for rk3399")
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> Not sure but a 'pm_runtime_get_sync()' is maybe also required in the
> 'err_set_rate' path.
> ---
>   drivers/gpu/drm/rockchip/cdn-dp-core.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> index 9ab67a670885..0fe1ec8b8fb1 100644
> --- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> @@ -111,7 +111,7 @@ static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
>   	ret = pm_runtime_get_sync(dp->dev);
>   	if (ret < 0) {
>   		DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
> -		goto err_pclk;
> +		goto err_sync;

I think the name err_pm_runtime_get is better.
err_sync is not a clear name for the pm_runtime_get_sync.

>   	}
>   
>   	reset_control_assert(dp->core_rst);
> @@ -133,6 +133,7 @@ static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
>   	return 0;
>   
>   err_set_rate:
> +err_sync:

miss pm_runtime_put, it should be:

err_set_rate:
     pm_runtime_put(dp->dev);
err_pm_runtime_get:
     clk_disable_unprepare(dp->core_clk);
err_core_clk:

>   	clk_disable_unprepare(dp->core_clk);
>   err_core_clk:
>   	clk_disable_unprepare(dp->pclk);


-- 
Ｍark Yao