diff options
| author | Jacob Keller <jacob.e.keller@intel.com> | 2013-06-21 08:14:32 +0000 |
|---|---|---|
| committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2013-07-31 01:00:57 -0700 |
| commit | 8fecf67c7eafad28bb6725e326aef8a34ee1c045 (patch) | |
| tree | 6ea4a9fad5904441ef5772154d66d93c11b410ad /drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c | |
| parent | e027d1aec4bb49030646d2c186a721f94372d7f2 (diff) | |
| download | talos-obmc-linux-8fecf67c7eafad28bb6725e326aef8a34ee1c045.tar.gz talos-obmc-linux-8fecf67c7eafad28bb6725e326aef8a34ee1c045.zip | |
ixgbe: fix lockdep annotation issue for ptp's work item
This patch fixes a lockdep issue created due to ixgbe_ptp_stop always running
cancel_work_sync even if the work item had not been created properly with
INIT_WORK. This is caused because ixgbe_ptp_stop did not check to actually
ensure PTP was running first. The new implementation introduces a state in the
&adapter->state field which is used to indicate that PTP is running. (This
replaces the IXGBE_FLAG2_PTP_ENABLED field). This state will use the atomic
set_bit, test_bit, and test_and_clear_bit functions. ixgbe_ptp_stop will check
to ensure that PTP was enabled, (and if not, it will not attempt to do any
cleanup work from ixgbe_ptp_init). This resolves the lockdep annotation warning
found by Stephen Hemminger
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c index 331987d6815c..5184e2a1a7d8 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ptp.c @@ -885,8 +885,8 @@ void ixgbe_ptp_init(struct ixgbe_adapter *adapter) ixgbe_ptp_reset(adapter); - /* set the flag that PTP has been enabled */ - adapter->flags2 |= IXGBE_FLAG2_PTP_ENABLED; + /* enter the IXGBE_PTP_RUNNING state */ + set_bit(__IXGBE_PTP_RUNNING, &adapter->state); return; } @@ -899,10 +899,12 @@ void ixgbe_ptp_init(struct ixgbe_adapter *adapter) */ void ixgbe_ptp_stop(struct ixgbe_adapter *adapter) { - /* stop the overflow check task */ - adapter->flags2 &= ~(IXGBE_FLAG2_PTP_ENABLED | - IXGBE_FLAG2_PTP_PPS_ENABLED); + /* Leave the IXGBE_PTP_RUNNING state. */ + if (!test_and_clear_bit(__IXGBE_PTP_RUNNING, &adapter->state)) + return; + /* stop the PPS signal */ + adapter->flags2 &= ~IXGBE_FLAG2_PTP_PPS_ENABLED; ixgbe_ptp_setup_sdp(adapter); cancel_work_sync(&adapter->ptp_tx_work); |
