[PATCH v3] bcache: check bch_cached_dev_attach() return value

[mingzhe.zou@xxxxxxxxxxxx]

From: ZouMingzhe <mingzhe.zou@xxxxxxxxxxxx>

handle error when call bch_cached_dev_attach() function

Signed-off-by: Mingzhe Zou <mingzhe.zou@xxxxxxxxxxxx>
---
 drivers/md/bcache/super.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e4a53c849fa6..82be0ec83e1f 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1460,7 +1460,7 @@ static int register_bdev(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
 {
 	const char *err = "cannot allocate memory";
 	struct cache_set *c;
-	int ret = -ENOMEM;
+	int ret = -ENOMEM, ret_tmp;
 
 	memcpy(&dc->sb, sb, sizeof(struct cache_sb));
 	dc->bdev = bdev;
@@ -1480,8 +1480,15 @@ static int register_bdev(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
 
 	list_add(&dc->list, &uncached_devices);
 	/* attach to a matched cache set if it exists */
-	list_for_each_entry(c, &bch_cache_sets, list)
-		bch_cached_dev_attach(dc, c, NULL);
+	ret = 0;
+	err = "failed to attach cached device";
+	list_for_each_entry(c, &bch_cache_sets, list) {
+		ret_tmp = bch_cached_dev_attach(dc, c, NULL);
+		if (ret_tmp)
+			ret = ret_tmp;
+	}
+	if (ret)
+		goto err;
 
 	if (BDEV_STATE(&dc->sb) == BDEV_STATE_NONE ||
 	    BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) {
@@ -1981,6 +1988,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
 
 static int run_cache_set(struct cache_set *c)
 {
+	int ret = -EIO, ret_tmp;
 	const char *err = "cannot allocate memory";
 	struct cached_dev *dc, *t;
 	struct cache *ca = c->cache;
@@ -2133,8 +2141,15 @@ static int run_cache_set(struct cache_set *c)
 	if (bch_has_feature_obso_large_bucket(&c->cache->sb))
 		pr_err("Detect obsoleted large bucket layout, all attached bcache device will be read-only\n");
 
-	list_for_each_entry_safe(dc, t, &uncached_devices, list)
-		bch_cached_dev_attach(dc, c, NULL);
+	ret = 0;
+	err = "failed to attach cached device";
+	list_for_each_entry_safe(dc, t, &uncached_devices, list) {
+		ret_tmp = bch_cached_dev_attach(dc, c, NULL);
+		if (ret_tmp)
+			ret = ret_tmp;
+	}
+	if (ret)
+		goto err;
 
 	flash_devs_run(c);
 
@@ -2151,7 +2166,7 @@ static int run_cache_set(struct cache_set *c)
 
 	bch_cache_set_error(c, "%s", err);
 
-	return -EIO;
+	return ret;
 }
 
 static const char *register_cache_set(struct cache *ca)
-- 
2.17.1