list_add() corruption messages reported from shmem_fill_super()'s recently
introduced percpu_counter_init(): shmem_put_super() needs to remember to
percpu_counter_destroy(). And also check error from percpu_counter_init().
Reported to fix oopses in __free_pipe_info() but I cannot work that out!
Reported-and-bisected-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Tested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
mm/shmem.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- 2.6.36-rc1/mm/shmem.c 2010-08-16 00:18:01.000000000 -0700
+++ linux/mm/shmem.c 2010-08-17 14:42:56.000000000 -0700
@@ -2325,7 +2325,10 @@ static int shmem_show_options(struct seq
static void shmem_put_super(struct super_block *sb)
{
- kfree(sb->s_fs_info);
+ struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+
+ percpu_counter_destroy(&sbinfo->used_blocks);
+ kfree(sbinfo);
sb->s_fs_info = NULL;
}
@@ -2367,7 +2370,8 @@ int shmem_fill_super(struct super_block
#endif
spin_lock_init(&sbinfo->stat_lock);
- percpu_counter_init(&sbinfo->used_blocks, 0);
+ if (percpu_counter_init(&sbinfo->used_blocks, 0))
+ goto failed;
sbinfo->free_inodes = sbinfo->max_inodes;
sb->s_maxbytes = SHMEM_MAX_BYTES;
--
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