# \[patch 12/24\] wifi: iwlwifi: Adopt PTP cross timestamps to core changes - From: Thomas Gleixner \ - Date: 2026-05-26 17:14:31 - List: netdev - Page: https://ratatoskr.run/netdev/2026/05/17032608 - Thread: https://ratatoskr.run/kvmarm/2026/05/17032577/t.md ```text iwlwifi only supports CLOCK_REALTIME timestamps and provides an incomplete result without system counter values etc. It also zeros struct system_device_crosststamp, which is already zeroed in the core and initialized with the clock ID. Remove the zeroing and reject any request for a clock ID other than REALTIME. Signed-off-by: Thomas Gleixner Cc: Miri Korenblit Cc: Johannes Berg --- drivers/net/wireless/intel/iwlwifi/mld/ptp.c | 3 ++- drivers/net/wireless/intel/iwlwifi/mvm/ptp.c | 5 +++-- 2 files changed, 5 insertions(+), 3 deletions(-) --- a/drivers/net/wireless/intel/iwlwifi/mld/ptp.c +++ b/drivers/net/wireless/intel/iwlwifi/mld/ptp.c @@ -250,7 +250,8 @@ iwl_mld_phc_get_crosstimestamp(struct pt /* System (wall) time */ ktime_t sys_time; - memset(xtstamp, 0, sizeof(struct system_device_crosststamp)); + if (xtstamp->clock_id != CLOCK_REALTIME) + return -ENOTSUPP; ret = iwl_mld_get_crosstimestamp_fw(mld, &gp2, &sys_time); if (ret) { --- a/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/ptp.c @@ -160,13 +160,14 @@ iwl_mvm_phc_get_crosstimestamp(struct pt /* System (wall) time */ ktime_t sys_time; - memset(xtstamp, 0, sizeof(struct system_device_crosststamp)); - if (!mvm->ptp_data.ptp_clock) { IWL_ERR(mvm, "No PHC clock registered\n"); return -ENODEV; } + if (xtstamp->clock_id != CLOCK_REALTIME) + return -ENOTSUPP; + mutex_lock(&mvm->mutex); if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_SYNCED_TIME)) { ret = iwl_mvm_get_crosstimestamp_fw(mvm, &gp2, &sys_time); ```