[PATCH 11/18] misc: storage-by-uuid: consider only first diskuuid match

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Multiple devices with the same disk UUID shouldn't happen and if it
does, the existing code is not equipped to handle that.

Change  it, so only the first _disk_ is considered. diskuuid is in a
union with partuuid and that could lead to cdev partition being taken as
backend storage instead.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/misc/storage-by-uuid.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/storage-by-uuid.c b/drivers/misc/storage-by-uuid.c
index 8b8fd901685e..7bb987dffbec 100644
--- a/drivers/misc/storage-by-uuid.c
+++ b/drivers/misc/storage-by-uuid.c
@@ -143,10 +143,14 @@ static void check_exist(struct sbu *sbu)
 	struct cdev *cdev;
 
 	for_each_cdev(cdev) {
-		if (!strcmp(cdev->diskuuid, sbu->uuid)) {
-			dev_dbg(sbu->dev, "Found %s %s\n", cdev->name, cdev->diskuuid);
-			storage_by_uuid_add_partitions(sbu, cdev);
-		}
+		if (cdev_is_partition(cdev))
+			continue;
+		if (strcmp(cdev->diskuuid, sbu->uuid))
+			continue;
+
+		dev_dbg(sbu->dev, "Found %s %s\n", cdev->name, cdev->diskuuid);
+		storage_by_uuid_add_partitions(sbu, cdev);
+		return;
 	}
 }
 
-- 
2.39.5