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

commit a6100603a4a87fc436199362bdb81cb849faaf6e upstream.

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>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
index 35df708ffa53e907afa9096dd76a9c5d0a9b6d42..1cc83abb9b44ae611a6365e5f3f7d40e7664a2af 100644 (file)
--- a/drivers/infiniband/hw/mlx4/mad.c
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -531,7 +531,7 @@ 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)
@@ -600,9 +600,15 @@ int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port,
        wr.send_flags = IB_SEND_SIGNALED;
 
        ret = ib_post_send(src_qp, &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;
 }
 
@@ -1256,9 +1262,15 @@ int mlx4_ib_send_to_wire(struct mlx4_ib_dev *dev, int slave, u8 port,
 
 
        ret = ib_post_send(send_qp, &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;
 }