[PATCH 6.6.y] iommu/amd: Fixes refcount bug in iommu_v2 driver

[Siddharth Chintamaneni]

This fix addresses a refcount bug where the reference count was not
properly decremented due to the mmput function not being called when
mmu_notifier_register fails.

Signed-off-by: Siddharth Chintamaneni <sidchintamaneni@xxxxxxxxx>
---
 drivers/iommu/amd/iommu_v2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index 57c2fb1146e2..bce21e266d64 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -645,7 +645,7 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid,
 
 	ret = mmu_notifier_register(&pasid_state->mn, mm);
 	if (ret)
-		goto out_free;
+		goto out_mmput;
 
 	ret = set_pasid_state(dev_state, pasid_state, pasid);
 	if (ret)
@@ -673,6 +673,8 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, u32 pasid,
 
 out_unregister:
 	mmu_notifier_unregister(&pasid_state->mn, mm);
+
+out_mmput:
 	mmput(mm);
 
 out_free:
-- 
2.43.0