IB/mlx4: Fix error flow when sending mads under SRIOV

Fix mad send error flow to prevent double freeing address handles,
and leaking tx_ring entries when SRIOV is active.

If ib_mad_post_send fails, the address handle pointer in the tx_ring entry
must be set to NULL (or there will be a double-free) and tx_tail must be
incremented (or there will be a leak of tx_ring entries).
The tx_ring is handled the same way in the send-completion handler.

Fixes: 37bfc7c1e83f ("IB/mlx4: SR-IOV multiplex and demultiplex MADs")
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Reviewed-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index d68f506c1922..9c2e53d28f98 100644
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -527,7 +527,7 @@ int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port,
                 tun_tx_ix = (++tun_qp->tx_ix_head) & (MLX4_NUM_TUNNEL_BUFS - 1);
         spin_unlock(&tun_qp->tx_lock);
         if (ret)
-                goto out;
+                goto end;
 
         tun_mad = (struct mlx4_rcv_tunnel_mad *) (tun_qp->tx_ring[tun_tx_ix].buf.addr);
         if (tun_qp->tx_ring[tun_tx_ix].ah)
@@ -596,9 +596,15 @@ int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port,
         wr.wr.send_flags = IB_SEND_SIGNALED;
 
         ret = ib_post_send(src_qp, &wr.wr, &bad_wr);
-out:
-        if (ret)
-                ib_destroy_ah(ah);
+        if (!ret)
+                return 0;
+ out:
+        spin_lock(&tun_qp->tx_lock);
+        tun_qp->tx_ix_tail++;
+        spin_unlock(&tun_qp->tx_lock);
+        tun_qp->tx_ring[tun_tx_ix].ah = NULL;
+end:
+        ib_destroy_ah(ah);
         return ret;
 }
 
@@ -1326,9 +1332,15 @@ int mlx4_ib_send_to_wire(struct mlx4_ib_dev *dev, int slave, u8 port,
 
 
         ret = ib_post_send(send_qp, &wr.wr, &bad_wr);
+        if (!ret)
+                return 0;
+
+        spin_lock(&sqp->tx_lock);
+        sqp->tx_ix_tail++;
+        spin_unlock(&sqp->tx_lock);
+        sqp->tx_ring[wire_tx_ix].ah = NULL;
 out:
-        if (ret)
-                ib_destroy_ah(ah);
+        ib_destroy_ah(ah);
         return ret;
 }