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authorHugh Dickins <hughd@google.com>2010-08-17 15:23:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-17 18:33:11 -0700
commit602586a83b719df0fbd94196a1359ed35aeb2df3 (patch)
tree1ff381d77769e352397edd2f6a7aa8ca5ba929f1 /mm/shmem.c
parent19147d0eb1472eac690a9a708893d4de096bbfcf (diff)
downloadop-kernel-dev-602586a83b719df0fbd94196a1359ed35aeb2df3.zip
op-kernel-dev-602586a83b719df0fbd94196a1359ed35aeb2df3.tar.gz
shmem: put_super must percpu_counter_destroy
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-bisected-and-tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index dfaa0f4..080b09a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2325,7 +2325,10 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
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 *sb, void *data, int silent)
#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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