use ibv_get_device_list if present

(submitted from roland)

This commit was SVN r8712.

ompi/mca/btl/openib/btl_openib_component.c

@@ -305,7 +305,8 @@ mca_btl_base_module_t** mca_btl_openib_component_init(int *num_btl_modules,
     seedv[1] = opal_sys_timer_get_cycles();
     seedv[2] = opal_sys_timer_get_cycles();
     seed48(seedv);
-    
+
+#ifndef OMPI_MCA_BTL_OPENIB_HAVE_DEVICE_LIST
     /* Determine the number of hca's available on the host */
     dev_list = ibv_get_devices(); 
     if (NULL == dev_list) {
@@ -318,14 +319,17 @@ mca_btl_base_module_t** mca_btl_openib_component_init(int *num_btl_modules,
 
     dlist_for_each_data(dev_list, ib_dev, struct ibv_device)
         num_devs++; 
-    
+#else 
+    ib_devs = ibv_get_device_list(&num_devs);
+#endif
+
     if(0 == num_devs) { 
         mca_btl_base_error_no_nics("OpenIB", "HCA");
         mca_btl_openib_modex_send();
         return NULL; 
     }
-        
-    
+       
+#ifndef OMPI_MCA_BTL_OPENIB_HAVE_DEVICE_LIST
     /* Allocate space for the ib devices */ 
     ib_devs = (struct ibv_device**) malloc(num_devs * sizeof(struct ibv_dev*));
         if(NULL == ib_devs) {
@@ -338,7 +342,7 @@ mca_btl_base_module_t** mca_btl_openib_component_init(int *num_btl_modules,
     i = 0; 
     dlist_for_each_data(dev_list, ib_dev, struct ibv_device)
         ib_devs[i++] =  ib_dev; 
-    
+#endif
             
     /** We must loop through all the hca id's, get there handles and 
         for each hca we query the number of ports on the hca and set up 
@@ -449,10 +453,14 @@ mca_btl_base_module_t** mca_btl_openib_component_init(int *num_btl_modules,
         OBJ_CONSTRUCT(&openib_btl->recv_free_max, ompi_free_list_t);
         
         if(mca_btl_openib_module_init(openib_btl) != OMPI_SUCCESS) {
-            free(ib_devs);
-            return NULL;
+#ifdef OMPI_MCA_BTL_OPENIB_HAVE_DEVICE_LIST
+	    ibv_free_device_list(ib_devs);
+#else
+	    free(ib_devs);
+#endif
+	    return NULL;
         }
-  
+	
         mpool_resources.ib_pd = openib_btl->ib_pd; 
                 
         /* initialize the memory pool using the hca */ 
@@ -534,7 +542,11 @@ mca_btl_base_module_t** mca_btl_openib_component_init(int *num_btl_modules,
     mca_btl_openib_modex_send();
 
     *num_btl_modules = mca_btl_openib_component.ib_num_btls;
-    free(ib_devs);  
+#ifdef OMPI_MCA_BTL_OPENIB_HAVE_DEVICE_LIST
+    ibv_free_device_list(ib_devs);
+#else
+    free(ib_devs);
+#endif
     return btls;
 }