[PATCH v12 02/17] s390/vfio-ap: decrement reference count to KVM

[Tony Krowiak]

Decrement the reference count to KVM when notified that KVM pointer is
invalidated via the vfio group notifier.

Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxx>
Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>
---
 drivers/s390/crypto/vfio_ap_ops.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 66fd9784a156..31e39c1f6e56 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1095,7 +1095,11 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
 	matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
 
 	if (!data) {
+		if (matrix_mdev->kvm)
+			kvm_put_kvm(matrix_mdev->kvm);
+
 		matrix_mdev->kvm = NULL;
+
 		return NOTIFY_OK;
 	}
 
-- 
2.21.1