[PATCH net] ionic: check port ptr before use

[Shannon Nelson]

Check for corner case of port_init failure before using
the port_info pointer.

Fixes: 4d03e00a2140 ("ionic: Add initial ethtool support")
Signed-off-by: Shannon Nelson <snel...@pensando.io>
---
 drivers/net/ethernet/pensando/ionic/ionic_ethtool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c 
b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
index ed9808fc743b..35c72d4a78b3 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_ethtool.c
@@ -126,6 +126,11 @@ static int ionic_get_link_ksettings(struct net_device 
*netdev,
 
        ethtool_link_ksettings_zero_link_mode(ks, supported);
 
+       if (!idev->port_info) {
+               netdev_err(netdev, "port_info not initialized\n");
+               return -EOPNOTSUPP;
+       }
+
        /* The port_info data is found in a DMA space that the NIC keeps
         * up-to-date, so there's no need to request the data from the
         * NIC, we already have it in our memory space.
-- 
2.17.1