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Subject[-mm PATCH] register_memory/unregister_memory clean ups
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Hi Andrew,

While testing hotplug memory remove against -mm, I noticed
that unregister_memory() is not cleaning up /sysfs entries
correctly. It also de-references structures after destroying
them (luckily in the code which never gets used). So, I cleaned
up the code and fixed the extra reference issue.

Could you please include it in -mm ?

Thanks,
Badari

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>
---
drivers/base/memory.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)
Index: linux-2.6.24/drivers/base/memory.c
===================================================================
--- linux-2.6.24.orig/drivers/base/memory.c 2008-02-07 16:59:52.000000000 -0800
+++ linux-2.6.24/drivers/base/memory.c 2008-02-08 15:54:45.000000000 -0800
@@ -62,8 +62,8 @@ void unregister_memory_notifier(struct n
/*
* 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->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));
}

/*
@@ -361,7 +353,7 @@ static int add_memory_block(unsigned lon
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)
@@ -415,7 +407,7 @@ int remove_memory_block(unsigned long no
mem_remove_simple_file(mem, state);
mem_remove_simple_file(mem, phys_device);
mem_remove_simple_file(mem, removable);
- unregister_memory(mem, section, NULL);
+ unregister_memory(mem, section);

return 0;
}



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