From 56a06f65ac65ccef86ec6a1484b96e59eb0511ea Mon Sep 17 00:00:00 2001
From: Simon Xue <xxm@rock-chips.com>
Date: Tue, 8 Sep 2020 16:05:54 +0800
Subject: [PATCH] iommu: don't break detach if iommu shared by more than one
 master

Change-Id: I4fade6e770e124dcaca41d122965e8696f268556
Signed-off-by: Simon Xue <xxm@rock-chips.com>
---
 drivers/iommu/iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 93df1850443f..45053fbfe188 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1404,7 +1404,8 @@ void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
 		return;
 
 	mutex_lock(&group->mutex);
-	if (iommu_group_device_count(group) != 1) {
+	/* Don't break detach if iommu shared by more than one master */
+	if (iommu_group_device_count(group) < 1) {
 		WARN_ON(1);
 		goto out_unlock;
 	}