driver core: register_memory/unregister_memory clean ups and bugfix

register_memory()/unregister_memory() never gets called with
"root". unregister_memory() is accessing kobject_name of
the object just freed up. Since no one uses the code,
lets take the code out. And also, make register_memory() static.

Another bug fix - before calling unregister_memory()
remove_memory_block() gets a ref on kobject. unregister_memory()
need to drop that ref before calling sysdev_unregister().

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 15 deletions

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 1f3801a8184..7891f7c9726 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -62,8 +62,8 @@ void unregister_memory_notifier(struct notifier_block *nb)
 /*
  * register_memory - Setup a sysfs device for a memory block
  */
-int register_memory(struct memory_block *memory, struct mem_section *section,
-                struct node *root)
+static
+int register_memory(struct memory_block *memory, struct mem_section *section)
 {
         int error;
 
@@ -71,26 +71,18 @@ int register_memory(struct memory_block *memory, struct mem_section *section,
         memory->sysdev.id = __section_nr(section);
 
         error = sysdev_register(&memory->sysdev);
-
-        if (root && !error)
-                error = sysfs_create_link(&root->sysdev.kobj,
-                                          &memory->sysdev.kobj,
-                                          kobject_name(&memory->sysdev.kobj));
-
         return error;
 }
 
 static void
-unregister_memory(struct memory_block *memory, struct mem_section *section,
-                struct node *root)
+unregister_memory(struct memory_block *memory, struct mem_section *section)
 {
         BUG_ON(memory->sysdev.cls != &memory_sysdev_class);
         BUG_ON(memory->sysdev.id != __section_nr(section));
 
+        /* drop the ref. we got in remove_memory_block() */
+        kobject_put(&memory->sysdev.kobj);
         sysdev_unregister(&memory->sysdev);
-        if (root)
-                sysfs_remove_link(&root->sysdev.kobj,
-                                  kobject_name(&memory->sysdev.kobj));
 }
 
 /*
@@ -345,7 +337,7 @@ static int add_memory_block(unsigned long node_id, struct mem_section *section,
         mutex_init(&mem->state_mutex);
         mem->phys_device = phys_device;
 
-        ret = register_memory(mem, section, NULL);
+        ret = register_memory(mem, section);
         if (!ret)
                 ret = mem_create_simple_file(mem, phys_index);
         if (!ret)
@@ -396,7 +388,7 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
         mem_remove_simple_file(mem, phys_index);
         mem_remove_simple_file(mem, state);
         mem_remove_simple_file(mem, phys_device);
-        unregister_memory(mem, section, NULL);
+        unregister_memory(mem, section);
 
         return 0;
 }