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-h...@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
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
