linux-kernel - [PATCH RESEND] media: gspca: Add error handling for stv06xx_read

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Message-ID: <20250422030739.2042-1-vulab@iscas.ac.cn>
Date: Tue, 22 Apr 2025 11:07:39 +0800
From: Wentao Liang <vulab@...as.ac.cn>
To: hverkuil@...all.nl,
	mchehab@...nel.org
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Wentao Liang <vulab@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH RESEND] media: gspca: Add error handling for stv06xx_read_sensor()

In hdcs_init(), the return value of stv06xx_read_sensor() needs to be
checked. A proper implementation can be found in vv6410_dump(). Add a
check in loop condition and propergate error code to fix this issue.

Fixes: 4c98834addfe ("V4L/DVB (10048): gspca - stv06xx: New subdriver.")
Cc: stable@...r.kernel.org # v2.6+
Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
---
 drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c b/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c
index 5a47dcbf1c8e..303b055fefea 100644
--- a/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c
+++ b/drivers/media/usb/gspca/stv06xx/stv06xx_hdcs.c
@@ -520,12 +520,13 @@ static int hdcs_init(struct sd *sd)
 static int hdcs_dump(struct sd *sd)
 {
 	u16 reg, val;
+	int err = 0;
 
 	pr_info("Dumping sensor registers:\n");
 
-	for (reg = HDCS_IDENT; reg <= HDCS_ROWEXPH; reg++) {
-		stv06xx_read_sensor(sd, reg, &val);
+	for (reg = HDCS_IDENT; reg <= HDCS_ROWEXPH && !err; reg++) {
+		err = stv06xx_read_sensor(sd, reg, &val);
 		pr_info("reg 0x%02x = 0x%02x\n", reg, val);
 	}
-	return 0;
+	return (err < 0) ? err : 0;
 }
-- 
2.42.0.windows.2