linux-kernel - [PATCH] i2c: bcm2835: Fix the error handling in 'bcm2835_i2c

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Message-Id: <338008c444af4785a07fb5a402b60225a4964ae9.1629484876.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 20 Aug 2021 20:43:33 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     f.fainelli@...il.com, rjui@...adcom.com, sbranden@...adcom.com,
        nsaenz@...nel.org, wsa@...nel.org, krzk@...nel.org,
        stefan.wahren@...e.com, nh6z@...z.net, eric@...olt.net
Cc:     linux-i2c@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] i2c: bcm2835: Fix the error handling in 'bcm2835_i2c_probe()'

Some resource should be released if an error occurs in
'bcm2835_i2c_probe()'.
Add an error handling path and the needed 'clk_disable_unprepare()' and
'clk_rate_exclusive_put()' calls.

While at it, rework the bottom of the function to use this newly added
error handling path and have an explicit and more standard "return 0;" at
the end of the normal path.

Fixes: bebff81fb8b9 ("i2c: bcm2835: Model Divider in CCF")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/i2c/busses/i2c-bcm2835.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 37443edbf754..a2f19b4c2402 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -449,13 +449,14 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 	ret = clk_prepare_enable(i2c_dev->bus_clk);
 	if (ret) {
 		dev_err(&pdev->dev, "Couldn't prepare clock");
-		return ret;
+		goto err_put_exclusive_rate;
 	}
 
 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!irq) {
 		dev_err(&pdev->dev, "No IRQ resource\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto err_disable_unprepare_clk;
 	}
 	i2c_dev->irq = irq->start;
 
@@ -463,7 +464,7 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 			  dev_name(&pdev->dev), i2c_dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not request IRQ\n");
-		return -ENODEV;
+		goto err_disable_unprepare_clk;
 	}
 
 	adap = &i2c_dev->adapter;
@@ -481,7 +482,16 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 
 	ret = i2c_add_adapter(adap);
 	if (ret)
-		free_irq(i2c_dev->irq, i2c_dev);
+		goto err_free_irq;
+
+	return 0;
+
+err_free_irq:
+	free_irq(i2c_dev->irq, i2c_dev);
+err_disable_unprepare_clk:
+	clk_disable_unprepare(i2c_dev->bus_clk);
+err_put_exclusive_rate:
+	clk_rate_exclusive_put(i2c_dev->bus_clk);
 
 	return ret;
 }
-- 
2.30.2