Fixed BUG#15758: "Holding adaptive search latch in

 innobase_query_caching_of_table_permitted()".
 Applied the patch due to Heikki Tuuri.
 Also removed superfluous #ifdefs.


sql/sql_cache.cc:
  Applied the patch due to Heikki Tuuri.
   Query_cache::store_query(): Make InnoDB to release the adaptive
   hash index latch before MySQL acquires the query cache mutex.
sql/sql_class.cc:
  Removing superfluous #ifdefs (suggested by Sanja, also discussed with Serg).
sql/sql_cursor.cc:
  Removing superfluous #ifdefs (suggested by Sanja, also discussed with Serg).

sql/sql_cache.cc

@@ -830,6 +830,11 @@ sql mode: 0x%lx, sort len: %lu, conncat len: %lu",
                           flags.sql_mode,
                           flags.max_sort_length,
                           flags.group_concat_max_len));
+    /*
+     Make InnoDB to release the adaptive hash index latch before
+     acquiring the query cache mutex.
+    */
+    ha_release_temporary_latches(thd);
     STRUCT_LOCK(&structure_guard_mutex);
 
     if (query_cache_size == 0)

sql/sql_class.cc

@@ -919,14 +919,12 @@ bool select_send::send_data(List<Item> &items)
     return 0;
   }
 
-#ifdef HAVE_INNOBASE_DB
   /*
     We may be passing the control from mysqld to the client: release the
     InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
     by thd
   */
     ha_release_temporary_latches(thd);
-#endif
 
   List_iterator_fast<Item> li(items);
   Protocol *protocol= thd->protocol;
@@ -956,12 +954,10 @@ bool select_send::send_data(List<Item> &items)
 
 bool select_send::send_eof()
 {
-#ifdef HAVE_INNOBASE_DB
   /* We may be passing the control from mysqld to the client: release the
      InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
      by thd */
     ha_release_temporary_latches(thd);
-#endif
 
   /* Unlock tables before sending packet to gain some speed */
   if (thd->lock)

sql/sql_cursor.cc

@@ -445,9 +445,8 @@ Sensitive_cursor::fetch(ulong num_rows)
   if (error == NESTED_LOOP_CURSOR_LIMIT)
     join->resume_nested_loop= TRUE;
 
-#ifdef USING_TRANSACTIONS
     ha_release_temporary_latches(thd);
-#endif
+
   /* Grab free_list here to correctly free it in close */
   thd->restore_active_arena(this, &backup_arena);