linux-kernel - [PATCH 4.18 071/228] media: ov772x: add checks for register read errors

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Date:   Tue,  2 Oct 2018 06:22:48 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 071/228] media: ov772x: add checks for register read errors

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Akinobu Mita <akinobu.mita@...il.com>

[ Upstream commit 30f3b17eaf4913e9e56be15915ce57aae69db701 ]

This change adds checks for register read errors and returns correct
error code.

Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Hans Verkuil <hans.verkuil@...co.com>
Reviewed-by: Jacopo Mondi <jacopo@...ndi.org>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/i2c/ov772x.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/media/i2c/ov772x.c
+++ b/drivers/media/i2c/ov772x.c
@@ -1136,7 +1136,7 @@ static int ov772x_set_fmt(struct v4l2_su
 static int ov772x_video_probe(struct ov772x_priv *priv)
 {
 	struct i2c_client  *client = v4l2_get_subdevdata(&priv->subdev);
-	u8                  pid, ver;
+	int		    pid, ver, midh, midl;
 	const char         *devname;
 	int		    ret;
 
@@ -1146,7 +1146,11 @@ static int ov772x_video_probe(struct ov7
 
 	/* Check and show product ID and manufacturer ID. */
 	pid = ov772x_read(client, PID);
+	if (pid < 0)
+		return pid;
 	ver = ov772x_read(client, VER);
+	if (ver < 0)
+		return ver;
 
 	switch (VERSION(pid, ver)) {
 	case OV7720:
@@ -1162,13 +1166,17 @@ static int ov772x_video_probe(struct ov7
 		goto done;
 	}
 
+	midh = ov772x_read(client, MIDH);
+	if (midh < 0)
+		return midh;
+	midl = ov772x_read(client, MIDL);
+	if (midl < 0)
+		return midl;
+
 	dev_info(&client->dev,
 		 "%s Product ID %0x:%0x Manufacturer ID %x:%x\n",
-		 devname,
-		 pid,
-		 ver,
-		 ov772x_read(client, MIDH),
-		 ov772x_read(client, MIDL));
+		 devname, pid, ver, midh, midl);
+
 	ret = v4l2_ctrl_handler_setup(&priv->hdl);
 
 done: