diff options
Diffstat (limited to 'drivers/vfio/vfio.h')
| -rw-r--r-- | drivers/vfio/vfio.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index 56fab31f8e0f..039e3208d286 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -41,7 +41,15 @@ enum vfio_group_type { struct vfio_group { struct device dev; struct cdev cdev; + /* + * When drivers is non-zero a driver is attached to the struct device + * that provided the iommu_group and thus the iommu_group is a valid + * pointer. When drivers is 0 the driver is being detached. Once users + * reaches 0 then the iommu_group is invalid. + */ + refcount_t drivers; refcount_t users; + struct completion users_comp; unsigned int container_users; struct iommu_group *iommu_group; struct vfio_container *container; |