[Qemu-devel] [PULL 2/3] rdma: Fix cleanup in error paths

[Juan Quintela]

From: Padmanabh Ratnakar <address@hidden>

As part of commit e325b49a320b493cc5d69e263751ff716dc458fe,
order in which resources are destroyed was changed for fixing
a seg fault. Due to this change, CQ will never get destroyed as
CQ should be destroyed after QP destruction. Seg fault is caused
improper cleanup when connection fails. Fixing cleanup after
connection failure and order in which resources are destroyed
in qemu_rdma_cleanup() routine.

Signed-off-by: Meghana Cheripady <address@hidden>
Signed-off-by: Padmanabh Ratnakar <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
 migration/rdma.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/migration/rdma.c b/migration/rdma.c
index e6c3a67..77e3444 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2194,6 +2194,10 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
         }
     }

+    if (rdma->qp) {
+        rdma_destroy_qp(rdma->cm_id);
+        rdma->qp = NULL;
+    }
     if (rdma->cq) {
         ibv_destroy_cq(rdma->cq);
         rdma->cq = NULL;
@@ -2206,18 +2210,14 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
         ibv_dealloc_pd(rdma->pd);
         rdma->pd = NULL;
     }
-    if (rdma->listen_id) {
-        rdma_destroy_id(rdma->listen_id);
-        rdma->listen_id = NULL;
-    }
     if (rdma->cm_id) {
-        if (rdma->qp) {
-            rdma_destroy_qp(rdma->cm_id);
-            rdma->qp = NULL;
-        }
         rdma_destroy_id(rdma->cm_id);
         rdma->cm_id = NULL;
     }
+    if (rdma->listen_id) {
+        rdma_destroy_id(rdma->listen_id);
+        rdma->listen_id = NULL;
+    }
     if (rdma->channel) {
         rdma_destroy_event_channel(rdma->channel);
         rdma->channel = NULL;
@@ -2309,8 +2309,6 @@ static int qemu_rdma_connect(RDMAContext *rdma, Error 
**errp)
     if (ret) {
         perror("rdma_connect");
         ERROR(errp, "connecting to destination!");
-        rdma_destroy_id(rdma->cm_id);
-        rdma->cm_id = NULL;
         goto err_rdma_source_connect;
     }

@@ -2319,8 +2317,6 @@ static int qemu_rdma_connect(RDMAContext *rdma, Error 
**errp)
         perror("rdma_get_cm_event after rdma_connect");
         ERROR(errp, "connecting to destination!");
         rdma_ack_cm_event(cm_event);
-        rdma_destroy_id(rdma->cm_id);
-        rdma->cm_id = NULL;
         goto err_rdma_source_connect;
     }

@@ -2328,8 +2324,6 @@ static int qemu_rdma_connect(RDMAContext *rdma, Error 
**errp)
         perror("rdma_get_cm_event != EVENT_ESTABLISHED after rdma_connect");
         ERROR(errp, "connecting to destination!");
         rdma_ack_cm_event(cm_event);
-        rdma_destroy_id(rdma->cm_id);
-        rdma->cm_id = NULL;
         goto err_rdma_source_connect;
     }
     rdma->connected = true;
-- 
2.1.0