[PATCH 06/14] iommufd: Move putting a hwpt to a helper function

[Jason Gunthorpe <jgg@nvidia.com>]

Next patch will need to call this from two places.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/iommufd/device.c          |  6 +-----
 drivers/iommu/iommufd/iommufd_private.h | 10 ++++++++++
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index ea34dc5b0fd1e4..590f84afa06503 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -481,11 +481,7 @@ void iommufd_device_detach(struct iommufd_device *idev)
 	hwpt = iommufd_hw_pagetable_detach(idev);
 	mutex_unlock(&idev->igroup->lock);
 
-	if (hwpt->auto_domain)
-		iommufd_object_destroy_user(idev->ictx, &hwpt->obj);
-	else
-		refcount_dec(&hwpt->obj.users);
-
+	iommufd_hw_pagetable_put(idev->ictx, hwpt);
 	refcount_dec(&idev->obj.users);
 }
 EXPORT_SYMBOL_NS_GPL(iommufd_device_detach, IOMMUFD);
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 0497d6190fd1b3..c0c80181d05ed1 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -260,6 +260,16 @@ struct iommufd_hw_pagetable *
 iommufd_hw_pagetable_detach(struct iommufd_device *idev);
 void iommufd_hw_pagetable_destroy(struct iommufd_object *obj);
 
+static inline void iommufd_hw_pagetable_put(struct iommufd_ctx *ictx,
+					    struct iommufd_hw_pagetable *hwpt)
+{
+	lockdep_assert_not_held(&hwpt->ioas->mutex);
+	if (hwpt->auto_domain)
+		iommufd_object_destroy_user(ictx, &hwpt->obj);
+	else
+		refcount_dec(&hwpt->obj.users);
+}
+
 struct iommufd_group {
 	struct kref ref;
 	struct mutex lock;
-- 
2.39.1