linux-kernel - [PATCH net-next v3] stmmac: dwmac-intel-plat: remove redundant dwmac->data check in probe

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Message-Id: <20241115132632.599188-1-mordan@ispras.ru>
Date: Fri, 15 Nov 2024 16:26:32 +0300
From: Vitalii Mordan <mordan@...ras.ru>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: Vitalii Mordan <mordan@...ras.ru>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	Fedor Pchelkin <pchelkin@...ras.ru>,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Vadim Mutilin <mutilin@...ras.ru>,
	Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next v3] stmmac: dwmac-intel-plat: remove redundant dwmac->data check in probe

The driver’s compatibility with devices is confirmed earlier in
platform_match(). Since reaching probe means the device is valid,
the extra check can be removed to simplify the code.

Signed-off-by: Vitalii Mordan <mordan@...ras.ru>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
v2: Add a comment explaining why dwmac->data cannot be NULL, as per
Andrew Lunn's request.
v3: Resolve merge conflicts.
 .../stmicro/stmmac/dwmac-intel-plat.c         | 53 ++++++++++---------
 1 file changed, 28 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
index a433526dcbe8..d94f0a150e93 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
@@ -97,35 +97,38 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
 	dwmac->dev = &pdev->dev;
 	dwmac->tx_clk = NULL;
 
+	/*
+	 * This cannot return NULL at this point because the driver’s
+	 * compatibility with the device has already been validated in
+	 * platform_match().
+	 */
 	dwmac->data = device_get_match_data(&pdev->dev);
-	if (dwmac->data) {
-		if (dwmac->data->fix_mac_speed)
-			plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
-
-		/* Enable TX clock */
-		if (dwmac->data->tx_clk_en) {
-			dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
-			if (IS_ERR(dwmac->tx_clk))
-				return PTR_ERR(dwmac->tx_clk);
+	if (dwmac->data->fix_mac_speed)
+		plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
+
+	/* Enable TX clock */
+	if (dwmac->data->tx_clk_en) {
+		dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
+		if (IS_ERR(dwmac->tx_clk))
+			return PTR_ERR(dwmac->tx_clk);
+
+		ret = clk_prepare_enable(dwmac->tx_clk);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"Failed to enable tx_clk\n");
+			return ret;
+		}
 
-			ret = clk_prepare_enable(dwmac->tx_clk);
+		/* Check and configure TX clock rate */
+		rate = clk_get_rate(dwmac->tx_clk);
+		if (dwmac->data->tx_clk_rate &&
+		    rate != dwmac->data->tx_clk_rate) {
+			rate = dwmac->data->tx_clk_rate;
+			ret = clk_set_rate(dwmac->tx_clk, rate);
 			if (ret) {
 				dev_err(&pdev->dev,
-					"Failed to enable tx_clk\n");
-				return ret;
-			}
-
-			/* Check and configure TX clock rate */
-			rate = clk_get_rate(dwmac->tx_clk);
-			if (dwmac->data->tx_clk_rate &&
-			    rate != dwmac->data->tx_clk_rate) {
-				rate = dwmac->data->tx_clk_rate;
-				ret = clk_set_rate(dwmac->tx_clk, rate);
-				if (ret) {
-					dev_err(&pdev->dev,
-						"Failed to set tx_clk\n");
-					goto err_tx_clk_disable;
-				}
+					"Failed to set tx_clk\n");
+				goto err_tx_clk_disable;
 			}
 		}
 
-- 
2.25.1