From 4320cce7bef35e87fff6bd75f690d5616423f6c7 Mon Sep 17 00:00:00 2001
From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Mon, 20 Aug 2018 00:23:29 +0200
Subject: [PATCH] Use SmartPointer

---
 include/deal.II/lac/cuda_precondition.h | 19 +++++++++++++++----
 source/lac/cuda_precondition.cu         |  3 ++-
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/include/deal.II/lac/cuda_precondition.h b/include/deal.II/lac/cuda_precondition.h
index 73ce2a6440..8da6e50348 100644
--- a/include/deal.II/lac/cuda_precondition.h
+++ b/include/deal.II/lac/cuda_precondition.h
@@ -19,6 +19,7 @@
 #include <deal.II/base/config.h>
 
 #include <deal.II/base/cuda.h>
+#include <deal.II/base/smartpointer.h>
 
 #include <memory>
 
@@ -189,6 +190,11 @@ namespace CUDAWrappers
      */
     csrsv2Info_t info_Lt;
 
+    /**
+     * Pointer to the matrix this object was initialized with.
+     */
+    SmartPointer<const SparseMatrix<Number>> matrix_pointer;
+
     /**
      * Pointer to the values (on the device) of the computed preconditioning
      * matrix.
@@ -197,13 +203,13 @@ namespace CUDAWrappers
 
     /**
      * Pointer to the row pointer (on the device) of the sparse matrix this
-     * object was initialized with.
+     * object was initialized with. Guarded by matrix_pointer.
      */
     const int *P_row_ptr_dev;
 
     /**
      * Pointer to the column indices (on the device) of the sparse matrix this
-     * object was initialized with.
+     * object was initialized with. Guarded by matrix_pointer.
      */
     const int *P_column_index_dev;
 
@@ -403,6 +409,11 @@ namespace CUDAWrappers
      */
     csrsv2Info_t info_U;
 
+    /**
+     * Pointer to the matrix this object was initialized with.
+     */
+    SmartPointer<const SparseMatrix<Number>> matrix_pointer;
+
     /**
      * Pointer to the values (on the device) of the computed preconditioning
      * matrix.
@@ -411,13 +422,13 @@ namespace CUDAWrappers
 
     /**
      * Pointer to the row pointer (on the device) of the sparse matrix this
-     * object was initialized with.
+     * object was initialized with. Guarded by matrix_pointer.
      */
     const int *P_row_ptr_dev;
 
     /**
      * Pointer to the column indices (on the device) of the sparse matrix this
-     * object was initialized with.
+     * object was initialized with. Guarded by matrix_pointer.
      */
     const int *P_column_index_dev;
 
diff --git a/source/lac/cuda_precondition.cu b/source/lac/cuda_precondition.cu
index 26ab5d5832..0030d5ca05 100644
--- a/source/lac/cuda_precondition.cu
+++ b/source/lac/cuda_precondition.cu
@@ -1311,6 +1311,7 @@ namespace CUDAWrappers
     n_nonzero_elements = A.n_nonzero_elements();
     AssertDimension(A.m(), A.n());
 
+    matrix_pointer                      = &A;
     const auto          cusparse_matrix = A.get_cusparse_matrix();
     const Number *const A_val_dev       = std::get<0>(cusparse_matrix);
 
@@ -1626,7 +1627,7 @@ namespace CUDAWrappers
         policy_M = CUSPARSE_SOLVE_POLICY_NO_LEVEL;
       }
 
-
+    matrix_pointer     = &A;
     n_rows             = A.m();
     n_nonzero_elements = A.n_nonzero_elements();
     AssertDimension(A.m(), A.n());
-- 
2.39.5