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igb: Added rcu_lock to avoid race

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This patch adds rcu_lock to avoid possible race condition with igb_update_stats
function accessing the rings in free_ q_vector.

CC: Eric Dumazet <edumazet@google.com>
Signed-off-by: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Akeem G Abodunrin 2013-06-27 09:10:23 +00:00 committed by Jeff Kirsher
parent e5c3370ffb
commit 7f90128e24
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/intel/igb/igb_main.c
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@ -1013,7 +1013,7 @@ static void igb_free_q_vector(struct igb_adapter *adapter, int v_idx)
adapter->q_vector[v_idx] = NULL;
netif_napi_del(&q_vector->napi);
/* ixgbe_get_stats64() might access the rings on this vector,
/* igb_get_stats64() might access the rings on this vector,
* we must wait a grace period before freeing it.
*/
kfree_rcu(q_vector, rcu);
@ -4859,6 +4859,8 @@ void igb_update_stats(struct igb_adapter *adapter,
bytes = 0;
packets = 0;
rcu_read_lock();
for (i = 0; i < adapter->num_rx_queues; i++) {
u32 rqdpc = rd32(E1000_RQDPC(i));
struct igb_ring *ring = adapter->rx_ring[i];
@ -4894,6 +4896,7 @@ void igb_update_stats(struct igb_adapter *adapter,
}
net_stats->tx_bytes = bytes;
net_stats->tx_packets = packets;
rcu_read_unlock();
/* read stats registers */
adapter->stats.crcerrs += rd32(E1000_CRCERRS);