From: Denis Davydov <davydden@gmail.com>
Date: Tue, 12 Jun 2018 14:21:45 +0000 (+0200)
Subject: return from reset_ghost_values() immediately if exchanger.ghosts_were_set == true
X-Git-Tag: v9.1.0-rc1~1045^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f87c9a6b2f057faf546083a65f231b1e44a5be3;p=dealii.git

return from reset_ghost_values() immediately if exchanger.ghosts_were_set == true
---

diff --git a/include/deal.II/matrix_free/matrix_free.h b/include/deal.II/matrix_free/matrix_free.h
index 337069426b..154c9a6b4e 100644
--- a/include/deal.II/matrix_free/matrix_free.h
+++ b/include/deal.II/matrix_free/matrix_free.h
@@ -3151,6 +3151,10 @@ namespace internal
   reset_ghost_values(const std::vector<VectorStruct> &vec,
                      VectorDataExchange<dim, Number> &exchanger)
   {
+    // return immediately if there is nothing to do.
+    if (exchanger.ghosts_were_set == true)
+      return;
+
     for (unsigned int comp = 0; comp < vec.size(); comp++)
       reset_ghost_values(vec[comp], exchanger);
   }
@@ -3162,6 +3166,10 @@ namespace internal
   reset_ghost_values(const std::vector<VectorStruct *> &vec,
                      VectorDataExchange<dim, Number> &  exchanger)
   {
+    // return immediately if there is nothing to do.
+    if (exchanger.ghosts_were_set == true)
+      return;
+
     for (unsigned int comp = 0; comp < vec.size(); comp++)
       reset_ghost_values(*vec[comp], exchanger);
   }
@@ -3174,6 +3182,10 @@ namespace internal
                            std::integral_constant<bool, true>,
                            VectorDataExchange<dim, Number> &exchanger)
   {
+    // return immediately if there is nothing to do.
+    if (exchanger.ghosts_were_set == true)
+      return;
+
     for (unsigned int i = 0; i < vec.n_blocks(); ++i)
       reset_ghost_values(vec.block(i), exchanger);
   }