linux-kernel - [PATCH net-next v3 4/6] net: ravb: Move the update of ndev->features to ravb_set

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Message-Id: <20240213094110.853155-5-claudiu.beznea.uj@bp.renesas.com>
Date: Tue, 13 Feb 2024 11:41:08 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: s.shtylyov@....ru,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	biju.das.jz@...renesas.com
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	claudiu.beznea@...on.dev,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH net-next v3 4/6] net: ravb: Move the update of ndev->features to ravb_set_features()

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

Commit c2da9408579d ("ravb: Add Rx checksum offload support for GbEth")
introduced support for setting GbEth features. With this the IP-specific
features update functions update the ndev->features individually.

Next commits add runtime PM support for the ravb driver. The runtime PM
implementation will enable/disable the IP clocks on
the ravb_open()/ravb_close() functions. Accessing the IP registers with
clocks disabled blocks the system.

The ravb_set_features() function could be executed when the Ethernet
interface is closed so we need to ensure we don't access IP registers while
the interface is down when runtime PM support will be in place.

For these, move the update of ndev->features to ravb_set_features() and
make the IP-specific features set function return int. In this way we
update the ndev->features only when the IP-specific features set function
returns success and we can avoid code duplication when introducing
runtime PM registers protection.

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

Changes in v3:
- none; this patch is new

 drivers/net/ethernet/renesas/ravb_main.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 7a7f743a1fef..b3b91783bb7a 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2475,7 +2475,7 @@ static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
 	return 0;
 }
 
-static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
+static int ravb_set_rx_csum(struct net_device *ndev, bool enable)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	unsigned long flags;
@@ -2492,6 +2492,8 @@ static void ravb_set_rx_csum(struct net_device *ndev, bool enable)
 	ravb_rcv_snd_enable(ndev);
 
 	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
 }
 
 static int ravb_endisable_csum_gbeth(struct net_device *ndev, enum ravb_reg reg,
@@ -2542,7 +2544,6 @@ static int ravb_set_features_gbeth(struct net_device *ndev,
 			goto done;
 	}
 
-	ndev->features = features;
 done:
 	spin_unlock_irqrestore(&priv->lock, flags);
 
@@ -2557,8 +2558,6 @@ static int ravb_set_features_rcar(struct net_device *ndev,
 	if (changed & NETIF_F_RXCSUM)
 		ravb_set_rx_csum(ndev, features & NETIF_F_RXCSUM);
 
-	ndev->features = features;
-
 	return 0;
 }
 
@@ -2567,8 +2566,15 @@ static int ravb_set_features(struct net_device *ndev,
 {
 	struct ravb_private *priv = netdev_priv(ndev);
 	const struct ravb_hw_info *info = priv->info;
+	int ret;
 
-	return info->set_feature(ndev, features);
+	ret = info->set_feature(ndev, features);
+	if (ret)
+		return ret;
+
+	ndev->features = features;
+
+	return 0;
 }
 
 static const struct net_device_ops ravb_netdev_ops = {
-- 
2.39.2