diff options
| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2008-07-08 15:51:42 -0700 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-07-11 01:20:27 -0400 |
| commit | b5ca88eb335580dc48ef5ebb3b86719bdb5a4113 (patch) | |
| tree | 72e203e8a8ef8e3e090baf7b63a0c037ebf1a3ae | |
| parent | 34336635467c5102777ea8acf34fc8bf391f98c0 (diff) | |
ixgb: fix race on rx_buffer_len in mtu change
some random coverage testing found that when changing mtu
under heavy traffic load, NAPI would use the rx_buffer_len variable
after it had been changed by change_mtu.
Similar to e1000 bugs found long ago.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
| -rw-r--r-- | drivers/net/ixgb/ixgb_main.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c index 4bf6bbc6582..c3234c45104 100644 --- a/drivers/net/ixgb/ixgb_main.c +++ b/drivers/net/ixgb/ixgb_main.c @@ -1573,14 +1573,18 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu) return -EINVAL; } + if (old_max_frame == max_frame) + return 0; + + if (netif_running(netdev)) + ixgb_down(adapter, true); + adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */ netdev->mtu = new_mtu; - if ((old_max_frame != max_frame) && netif_running(netdev)) { - ixgb_down(adapter, true); + if (netif_running(netdev)) ixgb_up(adapter); - } return 0; } |