[PATCH iwl-net v3 07/15] ice: E822: cancel offset verification work during reset preparation

[Jacob Keller <jacob.e.keller@intel.com>]

From: Karol Kolacinski <karol.kolacinski@intel.com>

The offset verification work task for E822 is executed after a PHY restart
to complete vernier calibration. In the event that either Tx or Rx
calibration hasn't finished, it may still be executing when a reset occurs.

A single PF reset does not trigger a PHY restart, but larger resets (CORE,
GLOBAL, EMP) will initiate a PHY restart.

The ice_ptp_wait_for_offsets() function does check if the driver is
resetting, and will reschedule itself. However, it is possible that a given
execution is already past this check. The function may then fail to access
the sideband queue. It treats failures as a reason to re-schedule and check
again later. This re-schedule will then see the updated reset state via
ice_is_reset_in_progress() and will keep re-scheduling until the reset
finishes.

The larger resets will restart the PHY, canceling any outstanding vernier
calibration and forcing a restart. Preemptively cancel the task for non-PF
resets to avoid doing unnecessary checks while resetting. The task is not
canceled for a PF reset, otherwise nothing would restart the task to finish
vernier calibration after the reset.

Fixes: 95af1f1c4c9f ("ice: reschedule ice_ptp_wait_for_offset_valid during reset")
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Przemyslaw Korba <przemyslaw.korba@intel.com>
Reviewed-by: Maciek Machnikowski <maciej.machnikowski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 7f82439c47ee..7cc151b01a13 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -3006,6 +3006,9 @@ void ice_ptp_prepare_for_reset(struct ice_pf *pf, enum ice_reset_req reset_type)
 	if (reset_type == ICE_RESET_PFR)
 		return;
 
+	if (hw->mac_type == ICE_MAC_GENERIC)
+		kthread_cancel_delayed_work_sync(&ptp->port.ov_work);
+
 	if (ice_pf_src_tmr_owned(pf) && hw->mac_type == ICE_MAC_GENERIC_3K_E825)
 		ice_ptp_prepare_rebuild_sec(pf, false, reset_type);
 

-- 
2.56.0.rc0.395.gd1f3524e15dc