diff options
| author | Matthew Vick <matthew.vick@intel.com> | 2012-03-16 10:03:00 +0100 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2012-04-04 00:25:16 +0200 |
| commit | bf03085f85112eac2d19036ea3003071220285bb (patch) | |
| tree | 204f9390746aa2798589f6a4d037c3c6827593f0 /drivers/net | |
| parent | e1000e: prevent oops when adapter is being closed and reset simultaneously (diff) | |
| download | linux-bf03085f85112eac2d19036ea3003071220285bb.tar.xz linux-bf03085f85112eac2d19036ea3003071220285bb.zip | |
e1000e: Guarantee descriptor writeback flush success.
In rare circumstances, a descriptor writeback flush may not work if it
arrives on a specific clock cycle as a writeback request is going out.
Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/intel/e1000e/netdev.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 6878601f20c5..19ab2154802c 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -1059,6 +1059,13 @@ static void e1000_print_hw_hang(struct work_struct *work) ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD); /* execute the writes immediately */ e1e_flush(); + /* + * Due to rare timing issues, write to TIDV again to ensure + * the write is successful + */ + ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD); + /* execute the writes immediately */ + e1e_flush(); adapter->tx_hang_recheck = true; return; } @@ -3616,6 +3623,16 @@ static void e1000e_flush_descriptors(struct e1000_adapter *adapter) /* execute the writes immediately */ e1e_flush(); + + /* + * due to rare timing issues, write to TIDV/RDTR again to ensure the + * write is successful + */ + ew32(TIDV, adapter->tx_int_delay | E1000_TIDV_FPD); + ew32(RDTR, adapter->rx_int_delay | E1000_RDTR_FPD); + + /* execute the writes immediately */ + e1e_flush(); } static void e1000e_update_stats(struct e1000_adapter *adapter); |