we should make sure parents directory exist, and then create dir or
files under that.
Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
---
mm/backing-dev.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 74b52dfd5852..81f4a86ebbed 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -115,9 +115,11 @@ static const struct file_operations bdi_debug_stats_fops = {
static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
{
- bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
- bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
- bdi, &bdi_debug_stats_fops);
+ if (bdi_debug_root)
+ bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
+ if (bdi->debug_dir)
+ bdi->debug_stats = debugfs_create_file("stats", 0444,
+ bdi->debug_dir, bdi, &bdi_debug_stats_fops);
}
static void bdi_debug_unregister(struct backing_dev_info *bdi)
--
2.14.2
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