From: Vasant Hegde <vasant.hegde@amd.com>
Date: Wed, 15 Feb 2023 05:26:41 +0000
Subject: [PATCH] iommu/amd: Skip attach device domain is same as new domain
References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: f451c7a5a3b818ecfeba2ba258570769998baf3a

commit f451c7a5a3b818ecfeba2ba258570769998baf3a upstream.

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>
Cc: "Limonciello, Mario" <Mario.Limonciello@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/iommu/amd/iommu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 2f8c018e..26c96b82 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2161,6 +2161,13 @@ 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)
-- 
2.35.3