[PATCH net 0/2] sfc: fix PTP synchronization races
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COLD17d
SUPERSEDED
From: Alex Austin <hidden>
Date: 2026-10-09 18:32:55
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Subsystem:
networking drivers, sfc network driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Edward Cree, Linus Torvalds
Status: Superseded by v4 (posted 2026-10-26). [go to v4]
Revision v1 (4 revisions archived).
Revisions (4)
This series fixes PTP synchronization races found by code inspection. efx_ptp_pps_worker() and the SIOCSHWTSTAMP path through efx_ptp_change_mode() both call efx_ptp_synchronize(). Concurrent calls can interfere with the shared DMA handshake and synchronization state. PHC adjustments can also change the clock during a capture. Patch 1 serializes synchronization transactions and PHC operations. Patch 2 returns the PPS timestamp in caller-owned storage to prevent concurrent synchronization from overwriting it while the PPS worker reads it. Alex Austin (2): sfc: ptp: serialize host and MC synchronization transactions sfc: ptp: avoid racing PPS timestamp updates drivers/net/ethernet/sfc/ptp.c | 136 ++++++++++++++++++++++----------- 1 file changed, 90 insertions(+), 46 deletions(-) -- 2.34.1