[PATCH kernel v2 10/11] vfio: Check for unregistered notifiers when group is actually released

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This moves a check for unregistered notifiers from fops release
callback to the place where the group will actually be released.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---

This is going to be used in the following patch in cleanup
path. Since the next patch is RFC, this one might not be needed.
---
 drivers/vfio/vfio.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 6b9a98508939..083b581e87c0 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -403,6 +403,8 @@ static void vfio_group_release(struct kref *kref)
 	struct iommu_group *iommu_group = group->iommu_group;
 
 	WARN_ON(!list_empty(&group->device_list));
+	/* Any user didn't unregister? */
+	WARN_ON(group->notifier.head);
 
 	list_for_each_entry_safe(unbound, tmp,
 				 &group->unbound_list, unbound_next) {
@@ -1584,9 +1586,6 @@ static int vfio_group_fops_release(struct inode *inode, struct file *filep)
 
 	filep->private_data = NULL;
 
-	/* Any user didn't unregister? */
-	WARN_ON(group->notifier.head);
-
 	vfio_group_try_dissolve_container(group);
 
 	atomic_dec(&group->opened);
-- 
2.11.0