1 files changed, 5 insertions, 0 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 2c7a0f4f3cd7..7104ac816fb6 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -948,6 +948,11 @@ cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create)
         unsigned int major, minor;
 
         cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key));
+        if (cfqg && !cfqg->blkg.dev && bdi->dev && dev_name(bdi->dev)) {
+                sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
+                cfqg->blkg.dev = MKDEV(major, minor);
+                goto done;
+        }
         if (cfqg || !create)
                 goto done;