linux-kernel - [PATCH net-next v2 6/7] net: marvell: prestera: Avoid unnecessary DT lookups

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Date:   Thu, 24 Nov 2022 12:15:55 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        devicetree@...r.kernel.org, Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Michael Walle <michael@...le.cc>,
        Marcin Wojtas <mw@...ihalf.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Vadym Kochan <vadym.kochan@...ision.eu>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH net-next v2 6/7] net: marvell: prestera: Avoid unnecessary DT lookups

This driver fist makes an expensive DT lookup to retrieve its DT node
(this is a PCI driver) in order to later search for the
base-mac-provider property. This property has no reality upstream and
this code should not have been accepted like this in the first
place. Instead, there is a proper nvmem interface that should be
used. Let's avoid these extra lookups and rely on the nvmem internal
logic.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 .../net/ethernet/marvell/prestera/prestera_main.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
index 24f9d6024745..d4b48f674a88 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
@@ -862,17 +862,10 @@ static void prestera_event_handlers_unregister(struct prestera_switch *sw)
 
 static int prestera_switch_set_base_mac_addr(struct prestera_switch *sw)
 {
-	struct device_node *base_mac_np;
-	int ret = 0;
-
-	if (sw->np) {
-		base_mac_np = of_parse_phandle(sw->np, "base-mac-provider", 0);
-		if (base_mac_np) {
-			ret = of_get_mac_address(base_mac_np, sw->base_mac);
-			of_node_put(base_mac_np);
-		}
-	}
+	int ret;
 
+	if (sw->np)
+		ret = of_get_mac_address(sw->np, sw->base_mac);
 	if (!is_valid_ether_addr(sw->base_mac) || ret) {
 		eth_random_addr(sw->base_mac);
 		dev_info(prestera_dev(sw), "using random base mac address\n");
@@ -1376,7 +1369,7 @@ static int prestera_switch_init(struct prestera_switch *sw)
 {
 	int err;
 
-	sw->np = of_find_compatible_node(NULL, NULL, "marvell,prestera");
+	sw->np = sw->dev->dev->of_node;
 
 	err = prestera_hw_switch_init(sw);
 	if (err) {
-- 
2.34.1