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

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Date:   Tue, 16 Aug 2022 02:07:01 +0000
From:   Yuan Can <yuancan@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
        <iommu@...ts.linux.dev>
CC:     <linux-kernel@...r.kernel.org>, <yuancan@...wei.com>
Subject: [PATCH -next] iommu: return early when devices in a group require different domain type

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
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) {
-- 
2.17.1