[IB] fail SA queries if device initialization failed

If the SA query module's initialization fails for a device, then that
device won't have a struct ib_sa_device associated.  We should fail SA
queries in that case, rather than blindly dereferencing the NULL
pointer we get back from ib_get_client_data().

Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index 2626182..a2c4234 100644 (file)
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -583,10 +583,16 @@ int ib_sa_path_rec_get(struct ib_device *device, u8 port_num,
 {
        struct ib_sa_path_query *query;
        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
-       struct ib_sa_port   *port   = &sa_dev->port[port_num - sa_dev->start_port];
-       struct ib_mad_agent *agent  = port->agent;
+       struct ib_sa_port   *port;
+       struct ib_mad_agent *agent;
        int ret;
 
+       if (!sa_dev)
+               return -ENODEV;
+
+       port  = &sa_dev->port[port_num - sa_dev->start_port];
+       agent = port->agent;
+
        query = kmalloc(sizeof *query, gfp_mask);
        if (!query)
                return -ENOMEM;
@@ -685,10 +691,16 @@ int ib_sa_service_rec_query(struct ib_device *device, u8 port_num, u8 method,
 {
        struct ib_sa_service_query *query;
        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
-       struct ib_sa_port   *port   = &sa_dev->port[port_num - sa_dev->start_port];
-       struct ib_mad_agent *agent  = port->agent;
+       struct ib_sa_port   *port;
+       struct ib_mad_agent *agent;
        int ret;
 
+       if (!sa_dev)
+               return -ENODEV;
+
+       port  = &sa_dev->port[port_num - sa_dev->start_port];
+       agent = port->agent;
+
        if (method != IB_MGMT_METHOD_GET &&
            method != IB_MGMT_METHOD_SET &&
            method != IB_SA_METHOD_DELETE)
@@ -768,10 +780,16 @@ int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num,
 {
        struct ib_sa_mcmember_query *query;
        struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
-       struct ib_sa_port   *port   = &sa_dev->port[port_num - sa_dev->start_port];
-       struct ib_mad_agent *agent  = port->agent;
+       struct ib_sa_port   *port;
+       struct ib_mad_agent *agent;
        int ret;
 
+       if (!sa_dev)
+               return -ENODEV;
+
+       port  = &sa_dev->port[port_num - sa_dev->start_port];
+       agent = port->agent;
+
        query = kmalloc(sizeof *query, gfp_mask);
        if (!query)
                return -ENOMEM;