[PATCH] iommu/sun50i: Remove IOMMU_DOMAIN_IDENTITY

[Jason Gunthorpe]

This driver treats IOMMU_DOMAIN_IDENTITY the same as UNMANAGED, which
cannot possibly be correct.

UNMANAGED domains are required to start out blocking all DMAs. This seems
to be what this driver does as it allocates a first level 'dt' for the IO
page table that is 0 filled.

Thus UNMANAGED looks like a working IO page table, and so IDENTITY must be
a mistake. Remove it.

Fixes: 4100b8c229b3 ("iommu: Add Allwinner H6 IOMMU driver")
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
 drivers/iommu/sun50i-iommu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index cd9b74ee24def1..0843418434ff3a 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -601,7 +601,6 @@ static struct iommu_domain *sun50i_iommu_domain_alloc(unsigned type)
 	struct sun50i_iommu_domain *sun50i_domain;
 
 	if (type != IOMMU_DOMAIN_DMA &&
-	    type != IOMMU_DOMAIN_IDENTITY &&
 	    type != IOMMU_DOMAIN_UNMANAGED)
 		return NULL;
 

base-commit: 328827239b9ce3a95b5c0d33e8875651580de053
-- 
2.38.1