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

Jason Gunthorpe
2023-02-25T00:28:09Z

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