[PATCH] libceph: fix misleading ceph_osdc_cancel_request() comment

[Ilya Dryomov <idryomov@gmail.com>]

cancel_request() never guaranteed that after its return the OSD
client would be completely done with the OSD request.  The callback
(if specified) can still be invoked and a ref can still be held.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 net/ceph/osd_client.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 4b88f2a4a6e2..9d82bb42e958 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -4591,8 +4591,13 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 EXPORT_SYMBOL(ceph_osdc_start_request);
 
 /*
- * Unregister a registered request.  The request is not completed:
- * ->r_result isn't set and __complete_request() isn't called.
+ * Unregister request.  If @req was registered, it isn't completed:
+ * r_result isn't set and __complete_request() isn't invoked.
+ *
+ * If @req wasn't registered, this call may have raced with
+ * handle_reply(), in which case r_result would already be set and
+ * __complete_request() would be getting invoked, possibly even
+ * concurrently with this call.
  */
 void ceph_osdc_cancel_request(struct ceph_osd_request *req)
 {
-- 
2.19.2