From 325d73bf8fea8af2227240b7305253fb052d3a68 Mon Sep 17 00:00:00 2001
From: Bob Liu <bob.liu@oracle.com>
Date: Fri, 3 Apr 2015 14:42:58 +0800
Subject: [PATCH] xen/blkback: safely unmap purge persistent grants
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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>
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