[PATCH] net/netvsc: fix mtu_set in netvsc devices

[Alexander Skorichenko]

Prevent segfault in hn_reinit() caused by changing the MTU for
an incompletely initialized device.

Signed-off-by: Alexander Skorichenko <askoriche...@netgate.com>
---
 drivers/net/netvsc/hn_ethdev.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index b8a32832d7..f8cb05a118 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -1127,8 +1127,10 @@ hn_reinit(struct rte_eth_dev *dev, uint16_t mtu)
        int i, ret = 0;
 
        /* Point primary queues at new primary channel */
-       rxqs[0]->chan = hv->channels[0];
-       txqs[0]->chan = hv->channels[0];
+       if (rxqs[0]) {
+               rxqs[0]->chan = hv->channels[0];
+               txqs[0]->chan = hv->channels[0];
+       }
 
        ret = hn_attach(hv, mtu);
        if (ret)
@@ -1140,10 +1142,12 @@ hn_reinit(struct rte_eth_dev *dev, uint16_t mtu)
                return ret;
 
        /* Point any additional queues at new subchannels */
-       for (i = 1; i < dev->data->nb_rx_queues; i++)
-               rxqs[i]->chan = hv->channels[i];
-       for (i = 1; i < dev->data->nb_tx_queues; i++)
-               txqs[i]->chan = hv->channels[i];
+       if (rxqs[0]) {
+               for (i = 1; i < dev->data->nb_rx_queues; i++)
+                       rxqs[i]->chan = hv->channels[i];
+               for (i = 1; i < dev->data->nb_tx_queues; i++)
+                       txqs[i]->chan = hv->channels[i];
+       }
 
        return ret;
 }
-- 
2.34.1