From c8367c4cd9de512d296fc557f121be62a43987f3 Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Thu, 19 May 2011 18:19:28 -0700 Subject: [PATCH] IB/mad: Return EPROTONOSUPPORT when an RDMA device lacks the QP required We had a script which was looping through the devices returned from ibstat and attempted to register a SMI agent on an ethernet device. This caused a kernel panic for IBoE devices that don't have QP0. Fix this by checking if the QP exists before using it. Signed-off-by: Ira Weiny Acked-by: Sean Hefty Signed-off-by: Roland Dreier --- drivers/infiniband/core/mad.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c index 822cfdcd9f78..b4d8672a3e4e 100644 --- a/drivers/infiniband/core/mad.c +++ b/drivers/infiniband/core/mad.c @@ -276,6 +276,13 @@ struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device, goto error1; } + /* Verify the QP requested is supported. For example, Ethernet devices + * will not have QP0 */ + if (!port_priv->qp_info[qpn].qp) { + ret = ERR_PTR(-EPROTONOSUPPORT); + goto error1; + } + /* Allocate structures */ mad_agent_priv = kzalloc(sizeof *mad_agent_priv, GFP_KERNEL); if (!mad_agent_priv) { -- 2.20.1