diff options
| author | Akeem G Abodunrin <akeem.g.abodunrin@intel.com> | 2013-06-27 09:10:23 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2013-08-22 02:25:29 -0700 |
| commit | 7f90128e246ea9827dd5ac532e49611aaf001892 (patch) | |
| tree | 9078b7cf0c6028f4036a9905eb0f4ece3ce2e8fa | |
| parent | e5c3370ffbe1336f7ee01233ba6b48a1ac06ec07 (diff) | |
igb: Added rcu_lock to avoid race
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>
| -rw-r--r-- | drivers/net/ethernet/intel/igb/igb_main.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 090ee56a9fc9..8e7c1b83da19 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -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); |