linux-kernel - Re: [PATCH] drm/meson: Fix refcount leak in meson_encoder_hdmi

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Date:   Thu, 12 May 2022 17:33:04 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Miaoqian Lin <linmq006@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/meson: Fix refcount leak in meson_encoder_hdmi_init

Hi,

On 12/05/2022 14:38, Martin Blumenstingl wrote:
> On Wed, May 11, 2022 at 7:41 AM Miaoqian Lin <linmq006@...il.com> wrote:
>>
>> of_find_device_by_node() takes reference, we should use put_device()
>> to release it when not need anymore.
>> Add missing put_device() in error path to avoid refcount
>> leak.
>>
>> Fixes: 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")
>> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> 
> Thanks for sending this patch!
> 
> Neil, while reviewing this I noticed that on module unload we're also
> not calling put_device().
> This note doesn't affect this patch - but I am wondering if we need to
> put that put_device() during module unload on our TODO-list?
> 

Indeed, it should be fixed.

Neil


> 
> Best regards,
> Martin