linux-kernel - [PATCH net-next v2 19/21] net: ravb: Do not set promiscuous mode if the interface is down

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Date:   Thu, 14 Dec 2023 13:45:58 +0200
From:   Claudiu <claudiu.beznea@...on.dev>
To:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
        p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
        wsa+renesas@...g-engineering.com, geert+renesas@...der.be
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v2 19/21] net: ravb: Do not set promiscuous mode if the interface is down

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Do not allow setting promiscuous mode if the interface is down. In case
runtime PM is enabled, and while interface is down, the IP will be in reset
mode (as for some platforms disabling/enabling the clocks will switch the
IP to standby mode which will lead to losing registers' content).

Commit prepares for the addition of runtime PM.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v2:
- none; this patch is new

 drivers/net/ethernet/renesas/ravb_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 1995cf7ff084..633346b6cd7c 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2164,6 +2164,9 @@ static void ravb_set_rx_mode(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	unsigned long flags;
 
+	if (!netif_running(ndev))
+		return;
+
 	spin_lock_irqsave(&priv->lock, flags);
 	ravb_modify(ndev, ECMR, ECMR_PRM,
 		    ndev->flags & IFF_PROMISC ? ECMR_PRM : 0);
-- 
2.39.2