Revert 19658:28a197617286 "Fix up the synchronisation around grant

table map track handles".

There is no race since the hypercall takes the
domain-lock. Furthermore removing locking from get_maptrack_handle()
races gnttab_setup_table().

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/xen/include/xen/grant_table.h b/xen/include/xen/grant_table.h
index 1ab59434ab..096af9bb4c 100644
--- a/xen/include/xen/grant_table.h
+++ b/xen/include/xen/grant_table.h
@@ -91,8 +91,6 @@ struct grant_table {
     struct grant_mapping **maptrack;
     unsigned int          maptrack_head;
     unsigned int          maptrack_limit;
-    /* Lock protecting maptrack-related fields. */
-    spinlock_t            maptrack_lock;
     /* Lock protecting updates to active and shared grant tables. */
     spinlock_t            lock;
 };