xen/blkfront: Make sure that the device is fully ready before allowing release.
[ linux-2.6.18-xen changeset c1c57fea77e9 ] Signed-off-by: NWim Colgate <wim@xensource.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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