[PATCH 3/4] mtd: fixup corner case error handling in mtd_device_parse_register()

[Brian Norris <computersforpeace@gmail.com>]

Since commit 3efe41be224c ("mtd: implement common reboot notifier
boilerplate"), we might try to register a reboot notifier for an MTD
that failed to register. Let's avoid this by making the error path
clearer.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
 drivers/mtd/mtdcore.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 8bbbb751bf45..03eec42dc715 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -579,9 +579,15 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 		else
 			ret = nr_parts;
 	}
+	/* Didn't come up with either parsed OR fallback partitions */
+	if (ret < 0) {
+		pr_info("mtd: failed to find partitions\n");
+		goto out;
+	}
 
-	if (ret >= 0)
-		ret = mtd_add_device_partitions(mtd, real_parts, ret);
+	ret = mtd_add_device_partitions(mtd, real_parts, ret);
+	if (ret)
+		goto out;
 
 	/*
 	 * FIXME: some drivers unfortunately call this function more than once.
@@ -596,6 +602,7 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 		register_reboot_notifier(&mtd->reboot_notifier);
 	}
 
+out:
 	kfree(real_parts);
 	return ret;
 }
-- 
1.9.1