From: Parav Pandit <parav@xxxxxxxxxxxx> In case of LAP are used for RoCE, it can lead to a problem of sleeping a context while spin lock is held in below flow. cm_lap_handler ->spin_lock -> <..switch_case..> -> cm_init_av_for_response -> ib_init_ah_from_wc -> rdma_addr_find_l2_eth_by_grh wait_for_completion() Therefore ah attribute initialization is done for incoming lap requests outside of the lock context. Signed-off-by: Parav Pandit <parav@xxxxxxxxxxxx> Reviewed-by: Daniel Jurgens <danielj@xxxxxxxxxxxx> Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx> --- drivers/infiniband/core/cm.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index d12c50ee2b89..19fd1699dc52 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -3130,6 +3130,12 @@ static int cm_lap_handler(struct cm_work *work) if (!cm_id_priv) return -EINVAL; + ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, + work->mad_recv_wc->recv_buf.grh, + &cm_id_priv->av); + if (ret) + goto deref; + param = &work->cm_event.param.lap_rcvd; memset(&work->path[0], 0, sizeof(work->path[1])); cm_path_set_rec_type(work->port->cm_dev->ib_device, @@ -3176,11 +3182,6 @@ static int cm_lap_handler(struct cm_work *work) cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; cm_id_priv->tid = lap_msg->hdr.tid; - ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, - work->mad_recv_wc->recv_buf.grh, - &cm_id_priv->av); - if (ret) - goto unlock; cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, cm_id_priv); ret = atomic_inc_and_test(&cm_id_priv->work_count); -- 2.15.0 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
