[PATCH 2/4] bdi: convert bdi_debug_register to int

[weiping zhang <zhangweiping@didichuxing.com>]

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

Signed-off-by: weiping zhang <zhangweiping@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 5072be19d9b2..e9d6a1ede12b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -116,11 +116,23 @@ 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)
@@ -133,9 +145,10 @@ static inline int bdi_debug_init(void)
 {
 	return 0;
 }
-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

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