netdev - [PATCH v3 4/8] net: macb: unprepare clocks in case of failure

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Date:   Wed, 9 Dec 2020 15:03:35 +0200
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <robh+dt@...nel.org>,
        <nicolas.ferre@...rochip.com>, <linux@...linux.org.uk>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <natechancellor@...il.com>, <ndesaulniers@...gle.com>
CC:     <yash.shah@...ive.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>,
        <clang-built-linux@...glegroups.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH v3 4/8] net: macb: unprepare clocks in case of failure

Unprepare clocks in case of any failure in fu540_c000_clk_init().

Fixes: c218ad559020 ("macb: Add support for SiFive FU540-C000")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 81704985a79b..11bf4f8d32e1 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4420,8 +4420,10 @@ static int fu540_c000_clk_init(struct platform_device *pdev, struct clk **pclk,
 		return err;
 
 	mgmt = devm_kzalloc(&pdev->dev, sizeof(*mgmt), GFP_KERNEL);
-	if (!mgmt)
-		return -ENOMEM;
+	if (!mgmt) {
+		err = -ENOMEM;
+		goto err_disable_clks;
+	}
 
 	init.name = "sifive-gemgxl-mgmt";
 	init.ops = &fu540_c000_ops;
@@ -4432,16 +4434,26 @@ static int fu540_c000_clk_init(struct platform_device *pdev, struct clk **pclk,
 	mgmt->hw.init = &init;
 
 	*tx_clk = devm_clk_register(&pdev->dev, &mgmt->hw);
-	if (IS_ERR(*tx_clk))
-		return PTR_ERR(*tx_clk);
+	if (IS_ERR(*tx_clk)) {
+		err = PTR_ERR(*tx_clk);
+		goto err_disable_clks;
+	}
 
 	err = clk_prepare_enable(*tx_clk);
-	if (err)
+	if (err) {
 		dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
-	else
+		*tx_clk = NULL;
+		goto err_disable_clks;
+	} else {
 		dev_info(&pdev->dev, "Registered clk switch '%s'\n", init.name);
+	}
 
 	return 0;
+
+err_disable_clks:
+	macb_clks_disable(*pclk, *hclk, *tx_clk, *rx_clk, *tsu_clk);
+
+	return err;
 }
 
 static int fu540_c000_init(struct platform_device *pdev)
-- 
2.7.4