diff options
| author | Parav Pandit <parav@mellanox.com> | 2017-11-14 14:52:15 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2017-12-18 15:37:11 -0700 |
| commit | 33f93e1ebcf5acfaef06cda2d3e373730519e33e (patch) | |
| tree | 97022d6574b15e387a9b79db612a145dd0df6f33 /drivers/infiniband/core/cm.c | |
| parent | 5cf3968afcc752fa2db6910e9694120b3373c73b (diff) | |
IB/cm: Fix sleeping while spin lock is held
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@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/core/cm.c')
| -rw-r--r-- | drivers/infiniband/core/cm.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index c6a816678675..c8fc92fdff76 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -3164,6 +3164,12 @@ 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, @@ -3210,11 +3216,6 @@ 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); |