From: Yan, Zheng <zheng.z.yan@intel.com>
Date: Wed, 30 Jul 2014 02:12:47 +0000 (+0800)
Subject: ceph: fix kick_requests()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=282c105225ec3229f344c5fced795b9e1e634440;p=linux-beck.git

ceph: fix kick_requests()

__do_request() may unregister the request. So we should update
iterator 'p' before calling __do_request()

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

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index fd8d7ca80e75..bad07c09f91e 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2067,11 +2067,12 @@ static void __wake_requests(struct ceph_mds_client *mdsc,
 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
 {
 	struct ceph_mds_request *req;
-	struct rb_node *p;
+	struct rb_node *p = rb_first(&mdsc->request_tree);
 
 	dout("kick_requests mds%d\n", mds);
-	for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
+	while (p) {
 		req = rb_entry(p, struct ceph_mds_request, r_node);
+		p = rb_next(p);
 		if (req->r_got_unsafe)
 			continue;
 		if (req->r_session &&