[PATCH rdma-rc] RDMA/counter: Prevent QP counter binding if counters unsupported

[Leon Romanovsky <leon@kernel.org>]

From: Mark Zhang <markz@mellanox.com>

In case of rdma_counter_init() fails, counter allocation and QP bind
should not be allowed.

Fixes: 413d3347503b ("RDMA/counter: Add set/clear per-port auto mode support")
Fixes: 1bd8e0a9d0fd ("RDMA/counter: Allow manual mode configuration support")
Signed-off-by: Mark Zhang <markz@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---
 drivers/infiniband/core/counters.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
index 45d5164e9574..b79890739a2c 100644
--- a/drivers/infiniband/core/counters.c
+++ b/drivers/infiniband/core/counters.c
@@ -38,6 +38,9 @@ int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
 	int ret;
 
 	port_counter = &dev->port_data[port].port_counter;
+	if (!port_counter->hstats)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&port_counter->lock);
 	if (on) {
 		ret = __counter_set_mode(&port_counter->mode,
@@ -509,6 +512,9 @@ int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u8 port,
 	if (!rdma_is_port_valid(dev, port))
 		return -EINVAL;
 
+	if (!dev->port_data[port].port_counter.hstats)
+		return -EOPNOTSUPP;
+
 	qp = rdma_counter_get_qp(dev, qp_num);
 	if (!qp)
 		return -ENOENT;
-- 
2.20.1