vfio: get rid of open-coding kref_put_mutex

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 7 deletions

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 0b025d58de81..92b85676e6be 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -264,6 +264,7 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
         return group;
 }
 
+/* called with vfio.group_lock held */
 static void vfio_group_release(struct kref *kref)
 {
         struct vfio_group *group = container_of(kref, struct vfio_group, kref);
@@ -287,13 +288,7 @@ static void vfio_group_release(struct kref *kref)
 
 static void vfio_group_put(struct vfio_group *group)
 {
-        mutex_lock(&vfio.group_lock);
-        /*
-         * Release needs to unlock to unregister the notifier, so only
-         * unlock if not released.
-         */
-        if (!kref_put(&group->kref, vfio_group_release))
-                mutex_unlock(&vfio.group_lock);
+        kref_put_mutex(&group->kref, vfio_group_release, &vfio.group_lock);
 }
 
 /* Assume group_lock or group reference is held */