From: Jason Gunthorpe jgg@mellanox.com
[ Upstream commit d1de9a88074b66482443f0cd91618d7b51a7c9b6 ]
All accesses to id.state must be done under the spinlock.
Fixes: a977049dacde ("[PATCH] IB: Add the kernel CM implementation") Link: https://lore.kernel.org/r/20200310092545.251365-10-leon@kernel.org Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/core/cm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 64f206e11d497..7251068b6af0f 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -1812,8 +1812,12 @@ static void cm_dup_req_handler(struct cm_work *work, counter[CM_REQ_COUNTER]);
/* Quick state check to discard duplicate REQs. */ - if (cm_id_priv->id.state == IB_CM_REQ_RCVD) + spin_lock_irq(&cm_id_priv->lock); + if (cm_id_priv->id.state == IB_CM_REQ_RCVD) { + spin_unlock_irq(&cm_id_priv->lock); return; + } + spin_unlock_irq(&cm_id_priv->lock);
ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); if (ret)