iommu/amd: Skip attach device domain is same as new domain

If device->domain is same as new domain then we can skip the
device attach process.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20230215052642.6016-2-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index f97c0bf930a7f3b53cc2e7ccfaca6c4b79d606d4..2aff392d98955592b2e273936b2201c0234a8c04 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2184,6 +2184,13 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
        struct amd_iommu *iommu = rlookup_amd_iommu(dev);
        int ret;
 
+       /*
+        * Skip attach device to domain if new domain is same as
+        * devices current domain
+        */
+       if (dev_data->domain == domain)
+               return 0;
+
        dev_data->defer_attach = false;
 
        if (dev_data->domain)