linux-kernel - Re: [PATCH v3] drm/mediatek: fix uninitialized symbol

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Message-ID: <4e36abcf-8cb3-4d3c-5ec4-52e1a011b66e@microchip.com>
Date:   Fri, 4 Aug 2023 05:17:57 +0000
From:   <Hari.PrasathGE@...rochip.com>
To:     <Nancy.Lin@...iatek.com>, <p.zabel@...gutronix.de>,
        <matthias.bgg@...il.com>, <chunkuang.hu@...nel.org>,
        <angelogioacchino.delregno@...labora.com>
CC:     <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Singo.Chang@...iatek.com>,
        <daniel@...ll.ch>, <dri-devel@...ts.freedesktop.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <airlied@...il.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] drm/mediatek: fix uninitialized symbol

On 04/08/23 7:34 am, Nancy Lin (林欣螢) wrote:
> [You don't often get email from nancy.lin@...iatek.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Hari,
> 
> Thanks for the review.
> 

you're welcome :)

> On Thu, 2023-08-03 at 10:15 +0000, Hari.PrasathGE@...rochip.com wrote:
>>
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>   On 03/08/23 3:18 pm, Nancy.Lin wrote:
>>> [You don't often get email from nancy.lin@...iatek.com. Learn why
>> this is important at https://aka.ms/LearnAboutSenderIdentification ]
>>>
>>> EXTERNAL EMAIL: Do not click links or open attachments unless you
>> know the content is safe
>>>
>>> fix Smatch static checker warning
>>>     -Fix uninitialized symbol comp_pdev in mtk_ddp_comp_init.
>>>
>>> Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver
>> for MT8195")
>>> Signed-off-by: Nancy.Lin <nancy.lin@...iatek.com>
>>> ---
>>> v3: fix reviewer comment in v2
>>> v2: add Fixes tag
>>> ---
>>>    drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 16 ++++++++--------
>>>    1 file changed, 8 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
>> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
>>> index f114da4d36a9..771f4e173353 100644
>>> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
>>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
>>> @@ -563,14 +563,15 @@ int mtk_ddp_comp_init(struct device_node
>> *node, struct mtk_ddp_comp *comp,
>>>           /* Not all drm components have a DTS device node, such as
>> ovl_adaptor,
>>>            * which is the drm bring up sub driver
>>>            */
>>> -       if (node) {
>>> -               comp_pdev = of_find_device_by_node(node);
>>> -               if (!comp_pdev) {
>>> -                       DRM_INFO("Waiting for device %s\n", node-
>>> full_name);
>>> -                       return -EPROBE_DEFER;
>>> -               }
>>> -               comp->dev = &comp_pdev->dev;
>>> +       if (!node)
>>> +               return 0;
>>> +
>>> +       comp_pdev = of_find_device_by_node(node);
>>> +       if (!comp_pdev) {
>>> +               DRM_INFO("Waiting for device %s\n", node-
>>> full_name);
>>> +               return -EPROBE_DEFER;
>>>           }
>>> +       comp->dev = &comp_pdev->dev;
>>>
>>>           if (type == MTK_DISP_AAL ||
>>>               type == MTK_DISP_BLS ||
>>> @@ -580,7 +581,6 @@ int mtk_ddp_comp_init(struct device_node *node,
>> struct mtk_ddp_comp *comp,
>>>               type == MTK_DISP_MERGE ||
>>>               type == MTK_DISP_OVL ||
>>>               type == MTK_DISP_OVL_2L ||
>>> -           type == MTK_DISP_OVL_ADAPTOR ||
>>
>> Is this also a related change ?
>>
> 
> These are the relevant modifications. MTK_DISP_OVL_ADAPTOR type
> component is a sub-driver of DRM that does not have a DTS node. This
> modification will return when checking if node is NULL, which means the
> comp with MTK_DISP_OVL_ADAPTOR type will also return above. Therefore,
> the condition "type == MTK_DISP_OVL_ADAPTOR" is unnecessary here.
> 
> Regards,
> Nancy
> 

Oh I didn't notice that it fixes a different commit(0d9eee9118b7) that 
you mentioned in your commit message. Thanks for the clarification.

>>>               type == MTK_DISP_PWM ||
>>>               type == MTK_DISP_RDMA ||
>>>               type == MTK_DPI ||
>>> --
>>> 2.18.0
>>>
>>>
>>> _______________________________________________
>>> linux-arm-kernel mailing list
>>> linux-arm-kernel@...ts.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>>
>>

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