linux-kernel - [PATCH v2] media: i2c: mt9p031: Check return value of clk_prepare_enable/clk_set

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Message-Id: <1390281657-7185-1-git-send-email-prabhakar.csengg@gmail.com>
Date:	Tue, 21 Jan 2014 10:50:57 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: [PATCH v2] media: i2c: mt9p031: Check return value of clk_prepare_enable/clk_set_rate

From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>

clk_set_rate(), clk_prepare_enable() functions can fail, so check the return
values to avoid surprises.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
---
 Changes for v2:
 1: Called regulator_bulk_disable() in the error path
 
 drivers/media/i2c/mt9p031.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index e5ddf47..05278f5 100644
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -222,12 +222,15 @@ static int mt9p031_clk_setup(struct mt9p031 *mt9p031)
 
 	struct i2c_client *client = v4l2_get_subdevdata(&mt9p031->subdev);
 	struct mt9p031_platform_data *pdata = mt9p031->pdata;
+	int ret;
 
 	mt9p031->clk = devm_clk_get(&client->dev, NULL);
 	if (IS_ERR(mt9p031->clk))
 		return PTR_ERR(mt9p031->clk);
 
-	clk_set_rate(mt9p031->clk, pdata->ext_freq);
+	ret = clk_set_rate(mt9p031->clk, pdata->ext_freq);
+	if (ret < 0)
+		return ret;
 
 	mt9p031->pll.ext_clock = pdata->ext_freq;
 	mt9p031->pll.pix_clock = pdata->target_freq;
@@ -286,8 +289,14 @@ static int mt9p031_power_on(struct mt9p031 *mt9p031)
 		return ret;
 
 	/* Emable clock */
-	if (mt9p031->clk)
-		clk_prepare_enable(mt9p031->clk);
+	if (mt9p031->clk) {
+		ret = clk_prepare_enable(mt9p031->clk);
+		if (ret) {
+			regulator_bulk_disable(ARRAY_SIZE(mt9p031->regulators),
+					       mt9p031->regulators);
+			return ret;
+		}
+	}
 
 	/* Now RESET_BAR must be high */
 	if (gpio_is_valid(mt9p031->reset)) {
-- 
1.7.9.5

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