• Alex Williamson's avatar
    vfio: Rework group release notifier warning · 65b1adeb
    Alex Williamson authored
    The intent of the original warning is make sure that the mdev vendor
    driver has removed any group notifiers at the point where the group
    is closed by the user.  Theoretically this would be through an
    orderly shutdown where any devices are release prior to the group
    release.  We can't always count on an orderly shutdown, the user can
    close the group before the notifier can be removed or the user task
    might be killed.  We'd like to add this sanity test when the group is
    idle and the only references are from the devices within the group
    themselves, but we don't have a good way to do that.  Instead check
    both when the group itself is removed and when the group is opened.
    A bit later than we'd prefer, but better than the current over
    aggressive approach.
    Fixes: ccd46dba
     ("vfio: support notifier chain in vfio_group")
    Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    Cc: <stable@vger.kernel.org> # v4.10
    Cc: Jike Song <jike.song@intel.com>