vfio: Move vfio_device_group_unregister() to be the first operation in unregister
This avoids endless vfio_device refcount increment by userspace, which would keep blocking the vfio_unregister_group_dev(). Reviewed-by:Jason Gunthorpe <jgg@nvidia.com> Tested-by:
Nicolin Chen <nicolinc@nvidia.com> Tested-by:
Matthew Rosato <mjrosato@linux.ibm.com> Tested-by:
Yanting Jiang <yanting.jiang@intel.com> Tested-by:
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Tested-by:
Terrence Xu <terrence.xu@intel.com> Tested-by:
Zhenzhong Duan <zhenzhong.duan@intel.com> Signed-off-by:
Yi Liu <yi.l.liu@intel.com> Link: https://lore.kernel.org/r/20230718135551.6592-17-yi.l.liu@intel.com Signed-off-by:
Alex Williamson <alex.williamson@redhat.com>
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