xen-netfront: release grant references used for the shared rings
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Authored by royger on May 27 2016, 3:55 PM.

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rS301200: xen-netfront: release grant references used for the shared rings

Summary

Just calling gnttab_end_foreign_access_ref doesn't free the references,
instead call gnttab_end_foreign_access with a NULL page argument in order to
have the grant references freed. The code that maps the ring
(xenbus_map_ring) already uses gnttab_grant_foreign_access which takes care
of allocating a grant reference.