fix module unload issue

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2001 bbd45198-f89e-11dd-88c7-29a3b14d5316

include/rtdef.h

@@ -781,10 +781,12 @@ struct rt_module
 	rt_uint32_t stack_size;                         /**< priority of module's thread                */
 	rt_uint32_t thread_priority;
 
+#ifdef RT_USING_SLAB
 	/* module memory allocator */
 	void        *mem_list;                          /**< module's free memory list                  */
 	void        *page_array;                        /**< module's using pages                       */
 	rt_uint32_t page_cnt;                           /**< module's using pages count                 */
+#endif
 
 	rt_uint32_t nsym;                               /**< number of symbol in the module             */
 	struct rt_module_symtab *symtab;                /**< module symbol table                        */

src/module.c

@@ -374,14 +374,14 @@ static struct rt_module* _load_shared_object(const char *name, void *module_ptr)
 	if (module_size == 0)
 	{
 		rt_kprintf(" module size error\n");
-
-		return module;
+		return RT_NULL;
 	}	
 
 	/* allocate module */
 	module = (struct rt_module *)rt_object_allocate(RT_Object_Class_Module, name);
-	if (!module)
-		return RT_NULL;
+	if (!module) return RT_NULL;
+
+	module->nref = 0;
 	
 	/* allocate module space */
 	module->module_space = rt_malloc(module_size);
@@ -774,10 +774,10 @@ rt_module_t rt_module_load(const char *name, void *module_ptr)
 
 	if (elf_module->e_entry != 0)
 	{	
+#ifdef RT_USING_SLAB
 		/* init module memory allocator */
 		module->mem_list = RT_NULL;
 
-#ifdef RT_USING_SLAB
 		/* create page array */
 		module->page_array = (void *)rt_malloc(PAGE_COUNT_MAX * sizeof(struct rt_page_info));
 		module->page_cnt = 0;
@@ -1527,7 +1527,6 @@ void *rt_module_realloc(void *ptr, rt_size_t size)
 		}
 	}
 }
-#endif
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
@@ -1569,3 +1568,5 @@ FINSH_FUNCTION_EXPORT(list_mempage, list module using memory page information)
 #endif
 
 #endif
+
+#endif