netdev - [PATCH net] sfc: Only cancel the PPS workqueue if it exists

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Message-ID: <157435873481.1746063.7779522257910378266.stgit@mh-desktop.uk.solarflarecom.com>
Date:   Thu, 21 Nov 2019 17:52:15 +0000
From:   Martin Habets <mhabets@...arflare.com>
To:     <davem@...emloft.net>, <linux-net-drivers@...arflare.com>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH net] 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@...arflare.com>
---
 drivers/net/ethernet/sfc/ptp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 02ed6d1b716c..af15a737c675 100644
--- 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);