igc: add lock preventing multiple simultaneous PTM transactions

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Add a mutex around the PTM transaction to prevent multiple transactors

Multiple processes try to initiate a PTM transaction, one or all may
fail. This can be reproduced by running two instances of the
following:

$ sudo phc2sys -O 0 -i tsn0 -m

PHC2SYS exits with:

"ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction
 fails

Note: Normally two instance of PHC2SYS will not run, but one process
 should not break another.

Fixes: a90ec84837 ("igc: Add support for PTP getcrosststamp()")
Signed-off-by: Christopher S M Hall <christopher.s.hall@intel.com>
Reviewed-by: Corinna Vinschen <vinschen@redhat.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

...

This commit is contained in:

Christopher S M Hall 2025-04-01 16:35:34 -07:00 • committed by Tony Nguyen

parent 1f025759ba

commit 1a931c4f5e

2 changed files with 19 additions and 2 deletions

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1

drivers/net/ethernet/intel/igc/igc.h

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20

drivers/net/ethernet/intel/igc/igc_ptp.c

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