[Intel-wired-lan] [PATCH iwl-net v4 6/6] igc: add lock preventing multiple simultaneous PTM transactions

[Mor Bar-Gabay]

On 02/04/2025 2:35, Jacob Keller wrote:
> From: Christopher S M Hall <christopher.s.hall at intel.com>
> 
> 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: a90ec8483732 ("igc: Add support for PTP getcrosststamp()")
> Signed-off-by: Christopher S M Hall <christopher.s.hall at intel.com>
> Reviewed-by: Corinna Vinschen <vinschen at redhat.com>
> Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc.h     |  1 +
>   drivers/net/ethernet/intel/igc/igc_ptp.c | 20 ++++++++++++++++++--
>   2 files changed, 19 insertions(+), 2 deletions(-)
> 
Tested-by: Mor Bar-Gabay <morx.bar.gabay at intel.com>