linux-kernel - [PATCH 1/2] i2c: synquacer: Fix an error handling path in synquacer_i2c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <a0fdf90803ab44508aa07f9190af5e00272231df.1704545258.git.christophe.jaillet@wanadoo.fr>
Date: Sat,  6 Jan 2024 13:48:24 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Ard Biesheuvel <ardb@...nel.org>,
	Andi Shyti <andi.shyti@...nel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Wolfram Sang <wsa@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-i2c@...r.kernel.org
Subject: [PATCH 1/2] i2c: synquacer: Fix an error handling path in synquacer_i2c_probe()

If an error occurs after the clk_prepare_enable() call, it should be undone
by a corresponding clk_disable_unprepare() call, as already done in the
remove() function.

As devm_clk_get() is used, we can switch to devm_clk_get_enabled() to
handle it automatically and fix the probe.

Update the remove() function accordingly and remove the now useless
clk_disable_unprepare() call.

Fixes: 0d676a6c4390 ("i2c: add support for Socionext SynQuacer I2C controller")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/i2c/busses/i2c-synquacer.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/i2c/busses/i2c-synquacer.c b/drivers/i2c/busses/i2c-synquacer.c
index bbea521b05dd..a73f5bb9a164 100644
--- a/drivers/i2c/busses/i2c-synquacer.c
+++ b/drivers/i2c/busses/i2c-synquacer.c
@@ -550,17 +550,13 @@ static int synquacer_i2c_probe(struct platform_device *pdev)
 	device_property_read_u32(&pdev->dev, "socionext,pclk-rate",
 				 &i2c->pclkrate);
 
-	i2c->pclk = devm_clk_get(&pdev->dev, "pclk");
-	if (PTR_ERR(i2c->pclk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-	if (!IS_ERR_OR_NULL(i2c->pclk)) {
-		dev_dbg(&pdev->dev, "clock source %p\n", i2c->pclk);
-
-		ret = clk_prepare_enable(i2c->pclk);
-		if (ret)
-			return dev_err_probe(&pdev->dev, ret, "failed to enable clock\n");
-		i2c->pclkrate = clk_get_rate(i2c->pclk);
-	}
+	i2c->pclk = devm_clk_get_enabled(&pdev->dev, "pclk");
+	if (IS_ERR(i2c->pclk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(i2c->pclk),
+				     "failed to get and enable clock\n");
+
+	dev_dbg(&pdev->dev, "clock source %p\n", i2c->pclk);
+	i2c->pclkrate = clk_get_rate(i2c->pclk);
 
 	if (i2c->pclkrate < SYNQUACER_I2C_MIN_CLK_RATE ||
 	    i2c->pclkrate > SYNQUACER_I2C_MAX_CLK_RATE)
@@ -615,8 +611,6 @@ static void synquacer_i2c_remove(struct platform_device *pdev)
 	struct synquacer_i2c *i2c = platform_get_drvdata(pdev);
 
 	i2c_del_adapter(&i2c->adapter);
-	if (!IS_ERR(i2c->pclk))
-		clk_disable_unprepare(i2c->pclk);
 };
 
 static const struct of_device_id synquacer_i2c_dt_ids[] __maybe_unused = {
-- 
2.34.1