[PATCH v2 1/3] bdi: convert bdi_debug_register to int

[weiping zhang]

Convert bdi_debug_register to int and then do error handle for it.

Reviewed-by: Jan Kara <j...@suse.cz>
Signed-off-by: weiping zhang <zhangweip...@didichuxing.com>
---
 mm/backing-dev.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 74b52dfd5852..b5f940ce0143 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -113,11 +113,23 @@ static const struct file_operations bdi_debug_stats_fops 
= {
        .release        = single_release,
 };
 
-static void bdi_debug_register(struct backing_dev_info *bdi, const char *name)
+static int bdi_debug_register(struct backing_dev_info *bdi, const char *name)
 {
+       if (!bdi_debug_root)
+               return -ENOMEM;
+
        bdi->debug_dir = debugfs_create_dir(name, bdi_debug_root);
+       if (!bdi->debug_dir)
+               return -ENOMEM;
+
        bdi->debug_stats = debugfs_create_file("stats", 0444, bdi->debug_dir,
                                               bdi, &bdi_debug_stats_fops);
+       if (!bdi->debug_stats) {
+               debugfs_remove(bdi->debug_dir);
+               return -ENOMEM;
+       }
+
+       return 0;
 }
 
 static void bdi_debug_unregister(struct backing_dev_info *bdi)
@@ -129,9 +141,10 @@ static void bdi_debug_unregister(struct backing_dev_info 
*bdi)
 static inline void bdi_debug_init(void)
 {
 }
-static inline void bdi_debug_register(struct backing_dev_info *bdi,
+static inline int bdi_debug_register(struct backing_dev_info *bdi,
                                      const char *name)
 {
+       return 0;
 }
 static inline void bdi_debug_unregister(struct backing_dev_info *bdi)
 {
-- 
2.14.2