[Patch](Resend) mm/sparse.c: Improve the error handling for sparse_add_one_section()

[WANG Cong]

On Mon, Nov 26, 2007 at 07:19:49PM +0900, Yasunori Goto wrote:
>Hi, Cong-san.
>
>>      ms->section_mem_map |= SECTION_MARKED_PRESENT;
>>  
>>      ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
>>  
>>  out:
>>      pgdat_resize_unlock(pgdat, &flags);
>> -    if (ret <= 0)
>> -            __kfree_section_memmap(memmap, nr_pages);
>> +
>>      return ret;
>>  }
>>  #endif
>
>Hmm. When sparse_init_one_section() returns error, memmap and 
>usemap should be free.

Hi, Yasunori.

Thanks for your comments. Is the following one fine for you?

Signed-off-by: WANG Cong <[EMAIL PROTECTED]>

---

Index: linux-2.6/mm/sparse.c
===================================================================
--- linux-2.6.orig/mm/sparse.c
+++ linux-2.6/mm/sparse.c
@@ -391,9 +391,17 @@ int sparse_add_one_section(struct zone *
         * no locking for this, because it does its own
         * plus, it does a kmalloc
         */
-       sparse_index_init(section_nr, pgdat->node_id);
+       ret = sparse_index_init(section_nr, pgdat->node_id);
+       if (ret < 0)
+               return ret;
        memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
+       if (!memmap)
+               return -ENOMEM;
        usemap = __kmalloc_section_usemap();
+       if (!usemap) {
+               __kfree_section_memmap(memmap, nr_pages);
+               return -ENOMEM;
+       }
 
        pgdat_resize_lock(pgdat, &flags);
 
@@ -403,10 +411,6 @@ int sparse_add_one_section(struct zone *
                goto out;
        }
 
-       if (!usemap) {
-               ret = -ENOMEM;
-               goto out;
-       }
        ms->section_mem_map |= SECTION_MARKED_PRESENT;
 
        ret = sparse_init_one_section(ms, section_nr, memmap, usemap);
@@ -414,7 +418,7 @@ int sparse_add_one_section(struct zone *
 out:
        pgdat_resize_unlock(pgdat, &flags);
        if (ret <= 0)
-               __kfree_section_memmap(memmap, nr_pages);
+               kfree(usemap);
        return ret;
 }
 #endif

-
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