[Xen-devel] [PATCH 11/12] xen/gntalloc: release grant references on page free

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

gnttab_end_foreign_access_ref does not return the grant reference it is
passed to the free list; gnttab_free_grant_reference needs to be
explicitly called. While gnttab_end_foreign_access provides a wrapper
for this, it is unsuitable because it does not return errors.

Reported-by: Anil Madhavapeddy <anil@xxxxxxxxxx>
Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 drivers/xen/gntalloc.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/gntalloc.c b/drivers/xen/gntalloc.c
index 60eee4e..7b936cc 100644
--- a/drivers/xen/gntalloc.c
+++ b/drivers/xen/gntalloc.c
@@ -191,6 +191,8 @@ static void __del_gref(struct gntalloc_gref *gref)
 
                if (!gnttab_end_foreign_access_ref(gref->gref_id, 0))
                        return;
+
+               gnttab_free_grant_reference(gref->gref_id);
        }
 
        gref_size--;
-- 
1.7.7.3


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