Comment 6 for bug 1495560

Reviewed: https://review.openstack.org/340655
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=4373e98fa0881c0bf6fa747e05742143402f4c39
Submitter: Jenkins
Branch: master

commit 4373e98fa0881c0bf6fa747e05742143402f4c39
Author: Nate Potter <email address hidden>
Date: Tue Jul 12 03:55:26 2016 +0000

    Remove race condition from lvextend

    Currently it's possible for extend_volume in lvm to return
    from the deactivate_lv call and try to extend the volume before
    the lv has actually been deactivated. This patch adds logic to
    make sure that the lv is deactivated before returning from
    deactivate_lv.

    Change-Id: Ifc9dcb20e17c60a835e9f3b38c5bffd836fa5188
    Closes-bug: #1495560