linux-kernel - [PATCH] i2c: busses: Fix error handling in synquacer_i2c

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Message-Id: <20220316064716.16587-1-linmq006@gmail.com>
Date:   Wed, 16 Mar 2022 06:47:16 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] i2c: busses: Fix error handling in synquacer_i2c_probe

In the error handling path, the clk_prepare_enable() function
call should be balanced by a corresponding 'clk_disable_unprepare()'
call, as already done in the remove function.

Fixes: 0d676a6c4390 ("i2c: add support for Socionext SynQuacer I2C controller")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/i2c/busses/i2c-synquacer.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-synquacer.c b/drivers/i2c/busses/i2c-synquacer.c
index e4026c5416b1..cd955224d629 100644
--- a/drivers/i2c/busses/i2c-synquacer.c
+++ b/drivers/i2c/busses/i2c-synquacer.c
@@ -569,22 +569,27 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 	    i2c->pclkrate > SYNQUACER_I2C_MAX_CLK_RATE) {
 		dev_err(&pdev->dev, "PCLK missing or out of range (%d)\n",
 			i2c->pclkrate);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_disable_clk;
 	}
 
 	i2c->base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(i2c->base))
-		return PTR_ERR(i2c->base);
+	if (IS_ERR(i2c->base)) {
+		ret = PTR_ERR(i2c->base);
+		goto err_disable_clk;
+	}
 
 	i2c->irq = platform_get_irq(pdev, 0);
-	if (i2c->irq < 0)
-		return i2c->irq;
+	if (i2c->irq < 0) {
+		ret = i2c->irq;
+		goto err_disable_clk;
+	}
 
 	ret = devm_request_irq(&pdev->dev, i2c->irq, synquacer_i2c_isr,
 			       0, dev_name(&pdev->dev), i2c);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
-		return ret;
+		goto err_disable_clk;
 	}
 
 	i2c->state = STATE_IDLE;
@@ -607,7 +612,7 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 	ret = i2c_add_numbered_adapter(&i2c->adapter);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add bus to i2c core\n");
-		return ret;
+		goto err_disable_clk;
 	}
 
 	platform_set_drvdata(pdev, i2c);
@@ -616,6 +621,11 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 		 dev_name(&i2c->adapter.dev));
 
 	return 0;
+
+err_disable_clk:
+	if (!IS_ERR(i2c->pclk))
+		clk_disable_unprepare(i2c->pclk);
+	return ret;
 }
 
 static int synquacer_i2c_remove(struct platform_device *pdev)
-- 
2.17.1