linux-kernel - [PATCH net-next v4 4/6] net: ravb: Move the update of ndev->features to ravb_set

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Date: Wed, 14 Feb 2024 15:57:58 +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 v4 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(). 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 v4:
- remove unnecessary code
- updated the patch description

Changes in v3:
- none; this patch is new

 drivers/net/ethernet/renesas/ravb_main.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 7a7f743a1fef..ac23779d1cc5 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2542,7 +2542,6 @@ static int ravb_set_features_gbeth(struct net_device *ndev,
 			goto done;
 	}

-	ndev->features = features;
 done:
 	spin_unlock_irqrestore(&priv->lock, flags);

@@ -2557,8 +2556,6 @@ 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 +2564,15 @@ 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;
+
+	ret = info->set_feature(ndev, features);
+	if (ret)
+		return ret;

-	return info->set_feature(ndev, features);
+	ndev->features = features;
+
+	return 0;
 }

 static const struct net_device_ops ravb_netdev_ops = {
-- 
2.39.2