The check to set identity map for tylersburg is done too late. It needs
to be done before the check for identity_map domain is done.

To: Joerg Roedel <j...@8bytes.org>
To: David Woodhouse <dw...@infradead.org>
Cc: iommu@lists.linux-foundation.org
Cc: linux-ker...@vger.kernel.org
Cc: sta...@vger.kernel.org
Cc: Ashok Raj <ashok....@intel.com>

Signed-off-by: Ashok Raj <ashok....@intel.com>
Reported-by: Yunhong Jiang <yunhong.ji...@intel.com>
---
 drivers/iommu/intel-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 8a18525..23eead3 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3325,13 +3325,14 @@ static int __init init_dmars(void)
        iommu_identity_mapping |= IDENTMAP_GFX;
 #endif
 
+       check_tylersburg_isoch();
+
        if (iommu_identity_mapping) {
                ret = si_domain_init(hw_pass_through);
                if (ret)
                        goto free_iommu;
        }
 
-       check_tylersburg_isoch();
 
        /*
         * If we copied translations from a previous kernel in the kdump
-- 
2.7.4

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