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Received: from ziggy.stardust ([37.223.141.54]) by smtp.gmail.com with ESMTPSA id h2sm5081660edq.33.2019.07.08.02.06.44 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Mon, 08 Jul 2019 02:06:44 -0700 (PDT) Subject: Re: [PATCH] [media] media: mtk-mdp: fix reference count on old device tree To: minghsiu.tsai@mediatek.com, houlong.wei@mediatek.com, andrew-ct.chen@mediatek.com, mchehab@kernel.org, djkurtz@chromium.org, Hans Verkuil , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20190621113250.4946-1-matthias.bgg@gmail.com> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa 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<20190621113250.4946-1-matthias.bgg@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 21/06/2019 13:32, Matthias Brugger wrote: > of_get_next_child() increments the reference count of the returning > device_node. Decrement it in the check if we are using the old or the > new DTB. > > Fixes: ba1f1f70c2c0 ("[media] media: mtk-mdp: Fix mdp device tree") > Signed-off-by: Matthias Brugger Any comments on that? > --- > drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > index bbb24fb95b95..bafe53c5d54a 100644 > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c > @@ -118,7 +118,9 @@ static int mtk_mdp_probe(struct platform_device *pdev) > mutex_init(&mdp->vpulock); > > /* Old dts had the components as child nodes */ > - if (of_get_next_child(dev->of_node, NULL)) { > + parent = of_get_next_child(dev->of_node, NULL); > + if (parent) { > + of_node_put(parent); > parent = dev->of_node; > dev_warn(dev, "device tree is out of date\n"); > } else { >