rds: Fix reference counting on the for xmit_atomic and xmit_rdma

This makes sure we have the proper number of references in
rds_ib_xmit_atomic and rds_ib_xmit_rdma.  We also consistently
drop references the same way for all message types as the IOs end.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index 82459e52c771..209dbc6d159d 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -757,6 +757,8 @@ int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op)
         send->s_wr.next = NULL;
         send->s_wr.wr.atomic.remote_addr = op->op_remote_addr;
         send->s_wr.wr.atomic.rkey = op->op_rkey;
+        send->s_op = op;
+        rds_message_addref(container_of(send->s_op, struct rds_message, atomic));
 
         /* map 8 byte retval buffer to the device */
         ret = ib_dma_map_sg(ic->i_cm_id->device, op->op_sg, 1, DMA_FROM_DEVICE);
@@ -857,13 +859,13 @@ int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
         for (i = 0; i < work_alloc && scat != &op->op_sg[op->op_count]; i++) {
                 send->s_wr.send_flags = 0;
                 send->s_queued = jiffies;
+                send->s_op = NULL;
 
                 rds_ib_set_wr_signal_state(ic, send, op->op_notify);
 
                 send->s_wr.opcode = op->op_write ? IB_WR_RDMA_WRITE : IB_WR_RDMA_READ;
                 send->s_wr.wr.rdma.remote_addr = remote_addr;
                 send->s_wr.wr.rdma.rkey = op->op_rkey;
-                send->s_op = op;
 
                 if (num_sge > rds_ibdev->max_sge) {
                         send->s_wr.num_sge = rds_ibdev->max_sge;
@@ -899,6 +901,12 @@ int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op)
                         send = ic->i_sends;
         }
 
+        /* give a reference to the last op */
+        if (scat == &op->op_sg[op->op_count]) {
+                prev->s_op = op;
+                rds_message_addref(container_of(op, struct rds_message, rdma));
+        }
+
         if (i < work_alloc) {
                 rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc - i);
                 work_alloc = i;