6.6-stable review patch. If anyone has any objections, please let me know.
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From: Martin Whitaker foss@martin-whitaker.me.uk
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@vger.kernel.org Link: https://lore.kernel.org/7aae307a-35ca-4209-a850-7b2749d40f90@martin-whitaker... Fixes: bb01ad30570b0 ("net: dsa: microchip: ptp: manipulating absolute time using ptp hw clock") Signed-off-by: Martin Whitaker foss@martin-whitaker.me.uk Reviewed-by: Andrew Lunn andrew@lunn.ch Acked-by: Arun Ramadoss arun.ramadoss@microchip.com Link: https://patch.msgid.link/20240817094141.3332-1-foss@martin-whitaker.me.uk Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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); }