ceph: Fix infinite loop in __wake_requests

__wake_requests() will enter infinite loop if we use it to wake
requests in the session->s_waiting list. __wake_requests() deletes
requests from the list and __do_request() adds requests back to
the list.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 62d2342eb267..9165eb8309eb 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1876,9 +1876,14 @@ finish:
 static void __wake_requests(struct ceph_mds_client *mdsc,
                             struct list_head *head)
 {
-        struct ceph_mds_request *req, *nreq;
+        struct ceph_mds_request *req;
+        LIST_HEAD(tmp_list);
+
+        list_splice_init(head, &tmp_list);
 
-        list_for_each_entry_safe(req, nreq, head, r_wait) {
+        while (!list_empty(&tmp_list)) {
+                req = list_entry(tmp_list.next,
+                                 struct ceph_mds_request, r_wait);
                 list_del_init(&req->r_wait);
                 __do_request(mdsc, req);
         }