2020-09-05 08:32:52

by Yu Kuai

Subject: [PATCH] drm/mediatek: add missing put_device() call in mtk_ddp_comp_init()

if of_find_device_by_node() succeed, mtk_ddp_comp_init() doesn't have
a corresponding put_device(). Thus add put_device() to fix the exception
handling for this function implementation.

Fixes: d0afe37f5209 ("drm/mediatek: support CMDQ interface in ddp component")
Signed-off-by: Yu Kuai <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 57c88de9a329..526648885b97 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -496,6 +496,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
if (of_address_to_resource(node, 0, &res) != 0) {
dev_err(dev, "Missing reg in %s node\n", node->full_name);
+ put_device(&larb_pdev->dev);
return -EINVAL;
}
comp->regs_pa = res.start;
--
2.25.4

2020-09-07 22:58:23

by Chun-Kuang Hu

Subject: Re: [PATCH] drm/mediatek: add missing put_device() call in mtk_ddp_comp_init()

Hi Yu Kuai:

Yu Kuai <[email protected]> 於 2020年9月5日 週六 下午4:31寫道：
>
> if of_find_device_by_node() succeed, mtk_ddp_comp_init() doesn't have
> a corresponding put_device(). Thus add put_device() to fix the exception
> handling for this function implementation.
>

This patch looks good to me, but I find another thing related to this.
mtk_ddp_comp_init() is called in a loop in mtk_drm_probe(), when this
component init fail, I think we should uninitialize previous
successive init component and put their device. Would you like to make
this patch more complete?

Regards,
Chun-Kuang.

> Fixes: d0afe37f5209 ("drm/mediatek: support CMDQ interface in ddp component")
> Signed-off-by: Yu Kuai <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 57c88de9a329..526648885b97 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -496,6 +496,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> if (of_address_to_resource(node, 0, &res) != 0) {
> dev_err(dev, "Missing reg in %s node\n", node->full_name);
> + put_device(&larb_pdev->dev);
> return -EINVAL;
> }
> comp->regs_pa = res.start;
> --
> 2.25.4
>

2020-09-08 01:09:54

by Yu Kuai

Subject: Re: [PATCH] drm/mediatek: add missing put_device() call in mtk_ddp_comp_init()

On 2020/09/08 6:56, Chun-Kuang Hu wrote:
> Hi Yu Kuai:
>
> Yu Kuai <[email protected]> 於 2020年9月5日 週六 下午4:31寫道：
>>
>> if of_find_device_by_node() succeed, mtk_ddp_comp_init() doesn't have
>> a corresponding put_device(). Thus add put_device() to fix the exception
>> handling for this function implementation.
>>
>
> This patch looks good to me, but I find another thing related to this.
> mtk_ddp_comp_init() is called in a loop in mtk_drm_probe(), when this
> component init fail, I think we should uninitialize previous
> successive init component and put their device. Would you like to make
> this patch more complete?

Hi,

Of course, thank you for your review.

Best regards,
Yu Kuai

2020-09-14 23:41:09

by Chun-Kuang Hu

Subject: Re: [PATCH] drm/mediatek: add missing put_device() call in mtk_ddp_comp_init()

Hi, Yu Kuai:

Yu Kuai <[email protected]> 於 2020年9月5日 週六 下午4:31寫道：
>
> if of_find_device_by_node() succeed, mtk_ddp_comp_init() doesn't have
> a corresponding put_device(). Thus add put_device() to fix the exception
> handling for this function implementation.
>

Reviewed-by: Chun-Kuang Hu <[email protected]>

> Fixes: d0afe37f5209 ("drm/mediatek: support CMDQ interface in ddp component")
> Signed-off-by: Yu Kuai <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 57c88de9a329..526648885b97 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -496,6 +496,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> if (of_address_to_resource(node, 0, &res) != 0) {
> dev_err(dev, "Missing reg in %s node\n", node->full_name);
> + put_device(&larb_pdev->dev);
> return -EINVAL;
> }
> comp->regs_pa = res.start;
> --
> 2.25.4
>