linux-kernel - [PATCH] backlight: ili922x: add an error code check in ili922x

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Date:   Thu, 30 Nov 2023 13:11:56 +0800
From:   Su Hui <suhui@...china.com>
To:     lee@...nel.org, daniel.thompson@...aro.org, jingoohan1@...il.com,
        deller@....de, nathan@...nel.org, ndesaulniers@...gle.com,
        trix@...hat.com
Cc:     Su Hui <suhui@...china.com>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, kernel-janitors@...r.kernel.org
Subject: [PATCH] backlight: ili922x: add an error code check in ili922x_write

Clang static analyzer complains that value stored to 'ret' is never read.
Return the error code when spi_sync() failed.

Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/video/backlight/ili922x.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/video/backlight/ili922x.c b/drivers/video/backlight/ili922x.c
index e7b6bd827986..47b872ac64a7 100644
--- a/drivers/video/backlight/ili922x.c
+++ b/drivers/video/backlight/ili922x.c
@@ -269,6 +269,10 @@ static int ili922x_write(struct spi_device *spi, u8 reg, u16 value)
 	spi_message_add_tail(&xfer_regindex, &msg);
 
 	ret = spi_sync(spi, &msg);
+	if (ret < 0) {
+		dev_err(&spi->dev, "Error sending SPI message 0x%x", ret);
+		return ret;
+	}
 
 	spi_message_init(&msg);
 	tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_REG,
-- 
2.30.2