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Subject[PATCH] iommu/intel-iommu: set as DUMMY_DEVICE_DOMAIN_INFO if no IOMMU
Date
If the device has no IOMMU, it still invokes iommu_need_mapping during
intel_alloc_coherent. However, iommu_need_mapping can only check the
device is DUMMY_DEVICE_DOMAIN_INFO or not. This patch marks the device
is a DUMMY_DEVICE_DOMAIN_INFO if the device has no IOMMU.

Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
---
drivers/iommu/intel-iommu.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 35a4a3abedc6..878bc986a015 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5612,8 +5612,10 @@ static int intel_iommu_add_device(struct device *dev)
int ret;

iommu = device_to_iommu(dev, &bus, &devfn);
- if (!iommu)
+ if (!iommu) {
+ dev->archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
return -ENODEV;
+ }

iommu_device_link(&iommu->iommu, dev);

--
2.25.0
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