linux-kernel - [PATCH net-next v3 18/19] net: ravb: Do not apply RX CSUM settings to hardware if the interface is down

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Date: Fri,  5 Jan 2024 10:23:38 +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
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	claudiu.beznea@...on.dev,
	geert+renesas@...der.be,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v3 18/19] net: ravb: Do not apply RX CSUM settings to hardware if the interface is down

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

Do not apply the RX CSUM settings to hardware if the interface is down. In
case runtime PM is enabled, and while the interface is down, the IP will be
in reset mode (as for some platforms disabling the clocks will switch the
IP to reset mode, which will lead to losing registers content) and applying
settings in reset mode is not an option. Instead, cache the RX CSUM
settings and apply them in ravb_open() though ravb_emac_init().

Commit prepares for the addition of runtime PM.

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

Changes in v3:
- this was patch 20/21 in v2
- fixed typos in patch description
- removed code from ravb_open()
- use ndev->flags & IFF_UP checks instead of netif_running()

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 168b6208db37..e909960fbc30 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2342,6 +2342,9 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
 	struct ravb_private *priv = netdev_priv(ndev);
 	unsigned long flags;
 
+	if (!(ndev->flags & IFF_UP))
+		return;
+
 	spin_lock_irqsave(&priv->lock, flags);
 
 	/* Disable TX and RX */
-- 
2.39.2