sfc: Only cancel the PPS workqueue if it exists

The workqueue only exists for the primary PF. For other functions
we hit a WARN_ON in kernel/workqueue.c.

Fixes: 7c236c43b838 ("sfc: Add support for IEEE-1588 PTP")
Signed-off-by: Martin Habets <mhabets@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 02ed6d1..af15a73 100644 (file)
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1531,7 +1531,8 @@ void efx_ptp_remove(struct efx_nic *efx)
        (void)efx_ptp_disable(efx);
 
        cancel_work_sync(&efx->ptp_data->work);
-       cancel_work_sync(&efx->ptp_data->pps_work);
+       if (efx->ptp_data->pps_workwq)
+               cancel_work_sync(&efx->ptp_data->pps_work);
 
        skb_queue_purge(&efx->ptp_data->rxq);
        skb_queue_purge(&efx->ptp_data->txq);