tree 668f710fb14540c3ac44fc9dbd83059a8acd1976
parent b787f68c36d49bb1d9236f403813641efa74a031
author Bob Liu <bob.liu@oracle.com> 1428043378 +0800
committer David Vrabel <david.vrabel@citrix.com> 1430131210 +0100

xen/blkback: safely unmap purge persistent grants

Commit c43cf3ea8385 ("xen-blkback: safely unmap grants in case they
are still in use") use gnttab_unmap_refs_async() to wait until the
mapped pages are no longer in use before unmapping them, but that
commit missed the persistent case.  Purge persistent pages can't be
unmapped either unless no longer in use.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>