linux-kernel - Re: [PATCH] drm/tegra: fix reference leak when pm_runtime_get

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Date:   Fri, 15 Jan 2021 17:26:10 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Qinglang Miao <miaoqinglang@...wei.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tegra: fix reference leak when pm_runtime_get_sync
 fails

On Tue, Dec 01, 2020 at 08:56:31PM +0800, Qinglang Miao wrote:
> The PM reference count is not expected to be incremented on
> return in these tegra functions.
> 
> However, pm_runtime_get_sync will increment the PM reference
> count even failed. Forgetting to putting operation will result
> in a reference leak here.
> 
> Replace it with pm_runtime_resume_and_get to keep usage
> counter balanced.
> 
> Fixes: fd67e9c6ed5a ("drm/tegra: Do not implement runtime PM")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> ---
>  drivers/gpu/drm/tegra/dc.c   | 2 +-
>  drivers/gpu/drm/tegra/dsi.c  | 2 +-
>  drivers/gpu/drm/tegra/hdmi.c | 2 +-
>  drivers/gpu/drm/tegra/hub.c  | 2 +-
>  drivers/gpu/drm/tegra/sor.c  | 2 +-
>  drivers/gpu/drm/tegra/vic.c  | 2 +-
>  6 files changed, 6 insertions(+), 6 deletions(-)

Applied, thanks.

Thierry

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