linux-kernel - [PATCH net-next 1/2] net: stmmac: dwmac-starfive: improve error handling during probe

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Message-Id: <20230827134150.2918-2-jszhang@kernel.org>
Date:   Sun, 27 Aug 2023 21:41:49 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Emil Renner Berthing <kernel@...il.dk>,
        Samin Guo <samin.guo@...rfivetech.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        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>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/2] net: stmmac: dwmac-starfive: improve error handling during probe

After stmmac_probe_config_dt() succeeds, when error happens later,
stmmac_remove_config_dt() needs to be called for proper error handling.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 .../ethernet/stmicro/stmmac/dwmac-starfive.c  | 34 ++++++++++++-------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
index 892612564694..b68f42795eaa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
@@ -111,18 +111,24 @@ static int starfive_dwmac_probe(struct platform_device *pdev)
 				     "dt configuration failed\n");
 
 	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
-	if (!dwmac)
-		return -ENOMEM;
+	if (!dwmac) {
+		err = -ENOMEM;
+		goto err_remove_config_dt;
+	}
 
 	dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
-	if (IS_ERR(dwmac->clk_tx))
-		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
-				     "error getting tx clock\n");
+	if (IS_ERR(dwmac->clk_tx)) {
+		err = dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
+				    "error getting tx clock\n");
+		goto err_remove_config_dt;
+	}
 
 	clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
-	if (IS_ERR(clk_gtx))
-		return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
-				     "error getting gtx clock\n");
+	if (IS_ERR(clk_gtx)) {
+		err = dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
+				    "error getting gtx clock\n");
+		goto err_remove_config_dt;
+	}
 
 	/* Generally, the rgmii_tx clock is provided by the internal clock,
 	 * which needs to match the corresponding clock frequency according
@@ -139,15 +145,17 @@ static int starfive_dwmac_probe(struct platform_device *pdev)
 
 	err = starfive_dwmac_set_mode(plat_dat);
 	if (err)
-		return err;
+		goto err_remove_config_dt;
 
 	err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
-	if (err) {
-		stmmac_remove_config_dt(pdev, plat_dat);
-		return err;
-	}
+	if (err)
+		goto err_remove_config_dt;
 
 	return 0;
+
+err_remove_config_dt:
+	stmmac_remove_config_dt(pdev, plat_dat);
+	return err;
 }
 
 static const struct of_device_id starfive_dwmac_match[] = {
-- 
2.40.1