linux-kernel - [PATCH v2 06/18] media: i2c: max9271: Check max9271

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Date:   Mon, 15 Mar 2021 14:15:00 +0100
From:   Jacopo Mondi <jacopo+renesas@...ndi.org>
To:     kieran.bingham+renesas@...asonboard.com,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/18] media: i2c: max9271: Check max9271_write() return

Check the return value of the max9271_write() function in the
max9271 library driver.

While at it, modify an existing condition to be made identical
to other checks.

Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
---
 drivers/media/i2c/max9271.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/media/i2c/max9271.c b/drivers/media/i2c/max9271.c
index c495582dcff6..2c7dc7fb9846 100644
--- a/drivers/media/i2c/max9271.c
+++ b/drivers/media/i2c/max9271.c
@@ -106,7 +106,10 @@ int max9271_set_serial_link(struct max9271_device *dev, bool enable)
 	 * Short delays here appear to show bit-errors in the writes following.
 	 * Therefore a conservative delay seems best here.
 	 */
-	max9271_write(dev, 0x04, val);
+	ret = max9271_write(dev, 0x04, val);
+	if (ret < 0)
+		return ret;
+
 	usleep_range(5000, 8000);
 
 	return 0;
@@ -118,7 +121,7 @@ int max9271_configure_i2c(struct max9271_device *dev, u8 i2c_config)
 	int ret;
 
 	ret = max9271_write(dev, 0x0d, i2c_config);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	/* The delay required after an I2C bus configuration change is not
@@ -143,7 +146,10 @@ int max9271_set_high_threshold(struct max9271_device *dev, bool enable)
 	 * Enable or disable reverse channel high threshold to increase
 	 * immunity to power supply noise.
 	 */
-	max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0));
+	ret = max9271_write(dev, 0x08, enable ? ret | BIT(0) : ret & ~BIT(0));
+	if (ret < 0)
+		return ret;
+
 	usleep_range(2000, 2500);
 
 	return 0;
@@ -152,6 +158,8 @@ EXPORT_SYMBOL_GPL(max9271_set_high_threshold);
 
 int max9271_configure_gmsl_link(struct max9271_device *dev)
 {
+	int ret;
+
 	/*
 	 * Configure the GMSL link:
 	 *
@@ -162,16 +170,24 @@ int max9271_configure_gmsl_link(struct max9271_device *dev)
 	 *
 	 * TODO: Make the GMSL link configuration parametric.
 	 */
-	max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN |
-		      MAX9271_EDC_1BIT_PARITY);
+	ret = max9271_write(dev, 0x07, MAX9271_DBL | MAX9271_HVEN |
+			    MAX9271_EDC_1BIT_PARITY);
+	if (ret < 0)
+		return ret;
+
 	usleep_range(5000, 8000);
 
 	/*
 	 * Adjust spread spectrum to +4% and auto-detect pixel clock
 	 * and serial link rate.
 	 */
-	max9271_write(dev, 0x02, MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES |
-		      MAX9271_PCLK_AUTODETECT | MAX9271_SERIAL_AUTODETECT);
+	ret = max9271_write(dev, 0x02,
+			    MAX9271_SPREAD_SPECT_4 | MAX9271_R02_RES |
+			    MAX9271_PCLK_AUTODETECT |
+			    MAX9271_SERIAL_AUTODETECT);
+	if (ret < 0)
+		return ret;
+
 	usleep_range(5000, 8000);
 
 	return 0;
-- 
2.30.0