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ice: use READ_ONCE() to access cached PHC time

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ptp.cached_phc_time is a 64-bit value updated by a periodic work item
on one CPU and read locklessly on another.  On 32-bit or non-atomic
architectures this can result in a torn read.  Use READ_ONCE() to
enforce a single atomic load.

Fixes: 77a781155a ("ice: enable receive hardware timestamping")
Cc: stable@vger.kernel.org
Signed-off-by: Sergey Temerkhanov <sergey.temerkhanov@intel.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20260717185340.3595286-9-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sergey Temerkhanov 2026-07-17 11:53:30 -07:00 committed by Jakub Kicinski
parent d6da9b7d48
commit 2915681b89
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/ice/ice_ptp.c
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@ -346,7 +346,7 @@ static u64 ice_ptp_extend_40b_ts(struct ice_pf *pf, u64 in_tstamp)
return 0;
}
return ice_ptp_extend_32b_ts(pf->ptp.cached_phc_time,
return ice_ptp_extend_32b_ts(READ_ONCE(pf->ptp.cached_phc_time),
(in_tstamp >> 8) & mask);
}