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-rw-r--r--drivers/infiniband/core/device.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index 270c7ff6cba7..10979844026a 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -650,10 +650,23 @@ int ib_query_port(struct ib_device *device,
u8 port_num,
struct ib_port_attr *port_attr)
{
+ union ib_gid gid;
+ int err;
+
if (port_num < rdma_start_port(device) || port_num > rdma_end_port(device))
return -EINVAL;
- return device->query_port(device, port_num, port_attr);
+ memset(port_attr, 0, sizeof(*port_attr));
+ err = device->query_port(device, port_num, port_attr);
+ if (err || port_attr->subnet_prefix)
+ return err;
+
+ err = ib_query_gid(device, port_num, 0, &gid, NULL);
+ if (err)
+ return err;
+
+ port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
+ return 0;
}
EXPORT_SYMBOL(ib_query_port);