[PATCH 4.8 068/140] [media] cx231xx: cant proceed if I2C bus register fails

[Greg Kroah-Hartman]

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

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

From: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>

commit 461af077d349b11106ca084e9ef2973a753d33ff upstream.

The driver should not ignore errors while registering the I2C
bus, as this device can't even minimally work without the buses,
as it uses those buses internally to talk with the several IP
blocks inside the chip.

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/media/usb/cx231xx/cx231xx-core.c |   24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

--- a/drivers/media/usb/cx231xx/cx231xx-core.c
+++ b/drivers/media/usb/cx231xx/cx231xx-core.c
@@ -1302,15 +1302,29 @@ int cx231xx_dev_init(struct cx231xx *dev
 	dev->i2c_bus[2].i2c_reserve = 0;
 
 	/* register I2C buses */
-	cx231xx_i2c_register(&dev->i2c_bus[0]);
-	cx231xx_i2c_register(&dev->i2c_bus[1]);
-	cx231xx_i2c_register(&dev->i2c_bus[2]);
+	errCode = cx231xx_i2c_register(&dev->i2c_bus[0]);
+	if (errCode < 0)
+		return errCode;
+	errCode = cx231xx_i2c_register(&dev->i2c_bus[1]);
+	if (errCode < 0)
+		return errCode;
+	errCode = cx231xx_i2c_register(&dev->i2c_bus[2]);
+	if (errCode < 0)
+		return errCode;
 
 	errCode = cx231xx_i2c_mux_create(dev);
+	if (errCode < 0) {
+		dev_err(dev->dev,
+			"%s: Failed to create I2C mux\n", __func__);
+		return errCode;
+	}
+	errCode = cx231xx_i2c_mux_register(dev, 0);
+	if (errCode < 0)
+		return errCode;
+
+	errCode = cx231xx_i2c_mux_register(dev, 1);
 	if (errCode < 0)
 		return errCode;
-	cx231xx_i2c_mux_register(dev, 0);
-	cx231xx_i2c_mux_register(dev, 1);
 
 	/* scan the real bus segments in the order of physical port numbers */
 	cx231xx_do_i2c_scan(dev, I2C_0);