linux-kernel - Re: [PATCH -next] iommu: return early when devices in a group require different domain type

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Date:   Wed, 17 Aug 2022 10:06:10 +0800
From:   Ethan Zhao <haifeng.zhao@...ux.intel.com>
To:     Yuan Can <yuancan@...wei.com>, joro@...tes.org, will@...nel.org,
        robin.murphy@....com, iommu@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] iommu: return early when devices in a group require
 different domain type

Yuan,

在 2022/8/16 10:07, Yuan Can 写道:
> When alloc default domain for an iommu_group in
> probe_alloc_default_domain, the expected domain
> type of each device in the iommu_group is checked
> in a loop, if two devices require different types,
> the loop can be breaked since the default domain
s/breaked/broken
> will be set to iommu_def_domain_type.
> Return 1 when this happened to break the loop in
> __iommu_group_for_each_dev.
>
> Signed-off-by: Yuan Can <yuancan@...wei.com>
> ---
>   drivers/iommu/iommu.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 74bc9111c7be..0d4d78946d31 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1653,6 +1653,7 @@ static int probe_get_default_domain_type(struct device *dev, void *data)
>   				 dev_name(gtype->dev),
>   				 iommu_domain_type_str(gtype->type));
>   			gtype->type = 0;
> +			return 1; /* end the outer loop */
>   		}
>   
>   		if (!gtype->dev) {

Thanks,

Ethan

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