xen/blkback: safely unmap purge persistent grants

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Commit c43cf3ea83 ("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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Bob Liu 2015-04-03 14:42:58 +08:00 • committed by David Vrabel

parent b787f68c36

commit 325d73bf8f

1 changed files with 18 additions and 6 deletions

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drivers/block/xen-blkback/blkback.c

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