vfio: Split the register_device ops call into functions

This is a container item.

A following patch will move the vfio_container functions to their own .c
file.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/7-v3-297af71838d2+b9-vfio_container_split_jgg@nvidia.comSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/vfio_main.c

@@ -1226,9 +1226,28 @@ static void vfio_device_unassign_container(struct vfio_device *device)
 	up_write(&device->group->group_rwsem);
 }
 
+static void vfio_device_container_register(struct vfio_device *device)
+{
+	struct vfio_iommu_driver *iommu_driver =
+		device->group->container->iommu_driver;
+
+	if (iommu_driver && iommu_driver->ops->register_device)
+		iommu_driver->ops->register_device(
+			device->group->container->iommu_data, device);
+}
+
+static void vfio_device_container_unregister(struct vfio_device *device)
+{
+	struct vfio_iommu_driver *iommu_driver =
+		device->group->container->iommu_driver;
+
+	if (iommu_driver && iommu_driver->ops->unregister_device)
+		iommu_driver->ops->unregister_device(
+			device->group->container->iommu_data, device);
+}
+
 static struct file *vfio_device_open(struct vfio_device *device)
 {
-	struct vfio_iommu_driver *iommu_driver;
 	struct file *filep;
 	int ret;
 
@@ -1259,12 +1278,7 @@ static struct file *vfio_device_open(struct vfio_device *device)
 			if (ret)
 				goto err_undo_count;
 		}
-
-		iommu_driver = device->group->container->iommu_driver;
-		if (iommu_driver && iommu_driver->ops->register_device)
-			iommu_driver->ops->register_device(
-				device->group->container->iommu_data, device);
-
+		vfio_device_container_register(device);
 		up_read(&device->group->group_rwsem);
 	}
 	mutex_unlock(&device->dev_set->lock);
@@ -1302,10 +1316,7 @@ static struct file *vfio_device_open(struct vfio_device *device)
 	if (device->open_count == 1 && device->ops->close_device) {
 		device->ops->close_device(device);
 
-		iommu_driver = device->group->container->iommu_driver;
-		if (iommu_driver && iommu_driver->ops->unregister_device)
-			iommu_driver->ops->unregister_device(
-				device->group->container->iommu_data, device);
+		vfio_device_container_unregister(device);
 	}
 err_undo_count:
 	up_read(&device->group->group_rwsem);
@@ -1513,7 +1524,6 @@ static inline void vfio_device_pm_runtime_put(struct vfio_device *device)
 static int vfio_device_fops_release(struct inode *inode, struct file *filep)
 {
 	struct vfio_device *device = filep->private_data;
-	struct vfio_iommu_driver *iommu_driver;
 
 	mutex_lock(&device->dev_set->lock);
 	vfio_assert_device_open(device);
@@ -1521,10 +1531,7 @@ static int vfio_device_fops_release(struct inode *inode, struct file *filep)
 	if (device->open_count == 1 && device->ops->close_device)
 		device->ops->close_device(device);
 
-	iommu_driver = device->group->container->iommu_driver;
-	if (iommu_driver && iommu_driver->ops->unregister_device)
-		iommu_driver->ops->unregister_device(
-			device->group->container->iommu_data, device);
+	vfio_device_container_unregister(device);
 	up_read(&device->group->group_rwsem);
 	device->open_count--;
 	if (device->open_count == 0)