linux-kernel - Re: [PATCH] drm/nouveau/dispnv50: fix runtime pm imbalance on error

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Date:   Wed, 03 Jun 2020 12:26:14 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>,
        Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>,
        Alex Deucher <alexander.deucher@....com>,
        Takashi Iwai <tiwai@...e.de>, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/nouveau/dispnv50: fix runtime pm imbalance on error

Hi! Was going through my email and found this from last month, it's a bit late
and someone might have reviewed/pushed this already but just in case:

Reviewed-by: Lyude Paul <lyude@...hat.com>

On Wed, 2020-05-20 at 18:47 +0800, Dinghao Liu wrote:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> the call returns an error code. Thus a pairing decrement is needed
> on the error handling path to keep the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/gpu/drm/nouveau/dispnv50/disp.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index 6be9df1820c5..e670756664ff 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -1123,8 +1123,10 @@ nv50_mstc_detect(struct drm_connector *connector,
>  		return connector_status_disconnected;
>  
>  	ret = pm_runtime_get_sync(connector->dev->dev);
> -	if (ret < 0 && ret != -EACCES)
> +	if (ret < 0 && ret != -EACCES) {
> +		pm_runtime_put_autosuspend(connector->dev->dev);
>  		return connector_status_disconnected;
> +	}
>  
>  	ret = drm_dp_mst_detect_port(connector, ctx, mstc->port->mgr,
>  				     mstc->port);