[PATCH RESEND] [SCSI] raid class: Fix error handling in raid_component_add

[Ma Ke]

The reference count of the device incremented in device_initialize() is
not decremented when device_add() fails. Add a put_device() call before
returning from the function to decrement reference count for cleanup.
Or it could cause memory leak.

As comment of device_add() says, if device_add() succeeds, you should
call device_del() when you want to get rid of it. If device_add() has
not succeeded, use only put_device() to drop the reference count.

Found by code review.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: ed542bed126c ("[SCSI] raid class: handle component-add errors")
Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx>
---
 drivers/scsi/raid_class.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/raid_class.c b/drivers/scsi/raid_class.c
index 898a0bdf8df6..2cb2949a78c6 100644
--- a/drivers/scsi/raid_class.c
+++ b/drivers/scsi/raid_class.c
@@ -251,6 +251,7 @@ int raid_component_add(struct raid_template *r,struct device *raid_dev,
 	list_del(&rc->node);
 	rd->component_count--;
 	put_device(component_dev);
+	put_device(&rc->dev);
 	kfree(rc);
 	return err;
 }
-- 
2.25.1