cfq-iosched: free cic_index if blkio_alloc_blkg_stats fails

If we fail allocating the blkpg stats, we free cfqd and cfgq.
But we need to free the IDA cfqd->cic_index as well.

Signed-off-by: majianpeng <majianpeng@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 5 insertions, 0 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 16ace89613b..3beed83437a 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -4036,6 +4036,11 @@ static void *cfq_init_queue(struct request_queue *q)
 
         if (blkio_alloc_blkg_stats(&cfqg->blkg)) {
                 kfree(cfqg);
+
+                spin_lock(&cic_index_lock);
+                ida_remove(&cic_index_ida, cfqd->cic_index);
+                spin_unlock(&cic_index_lock);
+
                 kfree(cfqd);
                 return NULL;
         }