From: Martin Whitaker <foss@xxxxxxxxxxxxxxxxxxxxx> commit 6efea5135417ae8194485d1d05ea79a21cf1a11c upstream. When performing the port_hwtstamp_set operation, ptp_schedule_worker() will be called if hardware timestamoing is enabled on any of the ports. When using multiple ports for PTP, port_hwtstamp_set is executed for each port. When called for the first time ptp_schedule_worker() returns 0. On subsequent calls it returns 1, indicating the worker is already scheduled. Currently the ksz driver treats 1 as an error and fails to complete the port_hwtstamp_set operation, thus leaving the timestamping configuration for those ports unchanged. This patch fixes this by ignoring the ptp_schedule_worker() return value. Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/7aae307a-35ca-4209-a850-7b2749d40f90@xxxxxxxxxxxxxxxxxxxxx Fixes: bb01ad30570b0 ("net: dsa: microchip: ptp: manipulating absolute time using ptp hw clock") Signed-off-by: Martin Whitaker <foss@xxxxxxxxxxxxxxxxxxxxx> Reviewed-by: Andrew Lunn <andrew@xxxxxxx> Acked-by: Arun Ramadoss <arun.ramadoss@xxxxxxxxxxxxx> Link: https://patch.msgid.link/20240817094141.3332-1-foss@xxxxxxxxxxxxxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/dsa/microchip/ksz_ptp.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/drivers/net/dsa/microchip/ksz_ptp.c +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -266,7 +266,6 @@ static int ksz_ptp_enable_mode(struct ks struct ksz_port *prt; struct dsa_port *dp; bool tag_en = false; - int ret; dsa_switch_for_each_user_port(dp, dev->ds) { prt = &dev->ports[dp->index]; @@ -277,9 +276,7 @@ static int ksz_ptp_enable_mode(struct ks } if (tag_en) { - ret = ptp_schedule_worker(ptp_data->clock, 0); - if (ret) - return ret; + ptp_schedule_worker(ptp_data->clock, 0); } else { ptp_cancel_worker_sync(ptp_data->clock); } Patches currently in stable-queue which might be from foss@xxxxxxxxxxxxxxxxxxxxx are queue-6.6/net-dsa-microchip-fix-ptp-config-failure-when-using-multiple-ports.patch
