[PATCH] [PATCH 5.10] iommu/mediatek: remove redundant comparison

[PATCH] [PATCH 5.10] iommu/mediatek: remove redundant comparison

[Alexandra Diupina]

iommu_device_register always returns 0 in 4.11-5.12, so
we need to remove redundant comparison with 0

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: b16c0170b53c ("iommu/mediatek: Make use of iommu_device_register interface")
Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
---
 drivers/iommu/mtk_iommu.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 051815c9d2bb..208c47218b75 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -748,9 +748,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 	iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
 	iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode);
 
-	ret = iommu_device_register(&data->iommu);
-	if (ret)
-		return ret;
+	iommu_device_register(&data->iommu);
 
 	spin_lock_init(&data->tlb_lock);
 	list_add_tail(&data->list, &m4ulist);
-- 
2.30.2


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Re: [PATCH] [PATCH 5.10] iommu/mediatek: remove redundant comparison

[Greg Kroah-Hartman]

On Thu, Aug 24, 2023 at 04:09:54PM +0300, Alexandra Diupina wrote:
> iommu_device_register always returns 0 in 4.11-5.12, so

What do you mean by "4.11-5.12"?

> we need to remove redundant comparison with 0

Why?

> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: b16c0170b53c ("iommu/mediatek: Make use of iommu_device_register interface")

How is this a fix if it isn't actually changing the code at all?

> Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
> ---
>  drivers/iommu/mtk_iommu.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 051815c9d2bb..208c47218b75 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -748,9 +748,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  	iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
>  	iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode);
>  
> -	ret = iommu_device_register(&data->iommu);
> -	if (ret)
> -		return ret;
> +	iommu_device_register(&data->iommu);

This is obviously incorrect, please fix your "tool" that is telling you
to make such a broken change.

Unless your tool wants to create buggy code?  If so, it's succeeding
very well.

greg k-h

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Re: [PATCH] [PATCH 5.10] iommu/mediatek: remove redundant comparison

[Greg Kroah-Hartman]

On Thu, Aug 24, 2023 at 04:09:54PM +0300, Alexandra Diupina wrote:
> iommu_device_register always returns 0 in 4.11-5.12, so
> we need to remove redundant comparison with 0
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: b16c0170b53c ("iommu/mediatek: Make use of iommu_device_register interface")
> Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
> ---
>  drivers/iommu/mtk_iommu.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 051815c9d2bb..208c47218b75 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -748,9 +748,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  	iommu_device_set_ops(&data->iommu, &mtk_iommu_ops);
>  	iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode);
>  
> -	ret = iommu_device_register(&data->iommu);
> -	if (ret)
> -		return ret;
> +	iommu_device_register(&data->iommu);
>  
>  	spin_lock_init(&data->tlb_lock);
>  	list_add_tail(&data->list, &m4ulist);
> -- 
> 2.30.2
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>

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