From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
To: davem@davemloft.net
Cc: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>,
netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com,
jogreene@redhat.com, Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Subject: [net 1/2] igb: Fix oops on changing number of rings
Date: Thu, 7 May 2015 05:21:32 -0700 [thread overview]
Message-ID: <1431001293-19424-2-git-send-email-jeffrey.t.kirsher@intel.com> (raw)
In-Reply-To: <1431001293-19424-1-git-send-email-jeffrey.t.kirsher@intel.com>
From: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
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: 02ef6e1d0b00 ("igb: Fix queue allocation method to accommodate changing during runtime")
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
drivers/net/ethernet/intel/igb/igb_main.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8457d03..783d60ea 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1207,6 +1207,8 @@ 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;
--
2.1.0
next prev parent reply other threads:[~2015-05-07 12:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-07 12:21 [net 0/2][pull request] Intel Wired LAN Driver Updates 2015-05-07 Jeff Kirsher
2015-05-07 12:21 ` Jeff Kirsher [this message]
2015-05-07 12:21 ` [net 2/2] igb: Fix NULL assignment to incorrect variable in igb_reset_q_vector Jeff Kirsher
2015-05-10 2:24 ` [net 0/2][pull request] Intel Wired LAN Driver Updates 2015-05-07 David Miller
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