[PATCH v6 07/33] iommu: Avoid reallocate default domain for a group
From: Yong Wu <yong.wu@mediatek.com>
Date: 2021-01-11 11:21:27
Also in:
linux-arm-kernel, linux-iommu, linux-mediatek, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
If group->default_domain exists, avoid reallocate it. In some iommu drivers, there may be several devices share a group. Avoid realloc the default domain for this case. Signed-off-by: Yong Wu <yong.wu@mediatek.com> --- drivers/iommu/iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3d099a31ddca..f4b87e6abe80 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c@@ -266,7 +266,8 @@ int iommu_probe_device(struct device *dev) * support default domains, so the return value is not yet * checked. */ - iommu_alloc_default_domain(group, dev); + if (!group->default_domain) + iommu_alloc_default_domain(group, dev); if (group->default_domain) { ret = __iommu_attach_device(group->default_domain, dev);
--
2.18.0