[PATCH for-next] RDMA/srpt: Avoid print error when modify_port is not supported

[Kamal Heib <kamalheib1@gmail.com>]

Avoid printing the following error when modify_port isn't supported.

[47541.541145] ib_srpt disabling MAD processing failed.

Fixes: a42d985bd5b2 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 98552749d71c..eba2b156616d 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -628,12 +628,14 @@ static void srpt_unregister_mad_agent(struct srpt_device *sdev)
 		.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
 	};
 	struct srpt_port *sport;
+	int ret;
 	int i;
 
 	for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
 		sport = &sdev->port[i - 1];
 		WARN_ON(sport->port != i);
-		if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
+		ret = ib_modify_port(sdev->device, i, 0, &port_modify);
+		if (ret < 0 && ret != -EOPNOTSUPP)
 			pr_err("disabling MAD processing failed.\n");
 		if (sport->mad_agent) {
 			ib_unregister_mad_agent(sport->mad_agent);
-- 
2.21.1