[PATCH] xen/arm: smmuv1: remove iommu group when deassign a device

[Rahul Singh <rahul.singh@xxxxxxx>]

When a device is deassigned from the domain it is required to remove the
iommu group.

If we don't remove the group, the next time when we assign
a device, SME and S2CR will not be setup correctly for the device
because of that SMMU fault will be observed.

Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/drivers/passthrough/arm/smmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/drivers/passthrough/arm/smmu.c 
b/xen/drivers/passthrough/arm/smmu.c
index 5cacb2dd99..9a31c332d0 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -1690,6 +1690,8 @@ static void arm_smmu_detach_dev(struct iommu_domain 
*domain, struct device *dev)
        if (cfg)
                arm_smmu_master_free_smes(cfg);
 
+       iommu_group_put(dev_iommu_group(dev));
+       dev_iommu_group(dev) = NULL;
 }
 
 #if 0 /*
-- 
2.25.1