Commit 8236bc6e authored by Toshiaki Makita's avatar Toshiaki Makita Committed by Luis Henriques

igb: Fix oops on changing number of rings

commit c0a06ee1 upstream.

When changing the number of rings by ethtool -L, q_vectors are reused,
which causes oops because of uninitialized pointers.

- When an rx is reused as a tx, q_vector->rx.ring is not set to NULL, which
  misleads igb_poll() to determine that it has an rx ring although it
  actually points to the tx ring.
- When a tx is reused as an rx, q_vector->rx.ring->skb
  (q_vector->ring[0].skb) has a value that was used as tx_stats before.

Fix these problems by zeroing it out on reuseing it.

Fixes: 02ef6e1d ("igb: Fix queue allocation method to accommodate changing during runtime")
Signed-off-by: default avatarToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent dd563506
......@@ -1208,6 +1208,8 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter,
q_vector = adapter->q_vector[v_idx];
if (!q_vector)
q_vector = kzalloc(size, GFP_KERNEL);
else
memset(q_vector, 0, size);
if (!q_vector)
return -ENOMEM;
......
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