linux-kernel - [PATCH net-next 5/6] net: ethernet: ti: am65-cpsw-ethtool: configured critical setting only when no running netdevs

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Date:   Fri, 26 Jun 2020 21:17:08 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     "David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Murali Karicheri <m-karicheri2@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH net-next 5/6] net: ethernet: ti: am65-cpsw-ethtool: configured critical setting only when no running netdevs

Ensure that critical setting can only be configured when there are no
running netdevs - all ports are down.

Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
 drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
index f7b33875a385..496dafb25128 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
@@ -445,7 +445,7 @@ static int am65_cpsw_set_channels(struct net_device *ndev,
 	/* Check if interface is up. Can change the num queues when
 	 * the interface is down.
 	 */
-	if (netif_running(ndev))
+	if (common->usage_count)
 		return -EBUSY;
 
 	am65_cpsw_nuss_remove_tx_chns(common);
@@ -734,6 +734,9 @@ static int am65_cpsw_set_ethtool_priv_flags(struct net_device *ndev, u32 flags)
 
 	rrobin = !!(flags & AM65_CPSW_PRIV_P0_RX_PTYPE_RROBIN);
 
+	if (common->usage_count)
+		return -EBUSY;
+
 	if (common->est_enabled && rrobin) {
 		netdev_err(ndev,
 			   "p0-rx-ptype-rrobin flag conflicts with QOS\n");
-- 
2.17.1