stk-webcam: fix an endian bug in stk_camera_read_reg()

commit d08876f5 upstream.

We pass an int pointer to stk_camera_read_reg() but only write to the
highest byte.  It's a bug on big endian systems and generally a nasty
thing to do and doesn't match the write function either.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/media/usb/stkwebcam/stk-sensor.c

@@ -228,7 +228,7 @@
 static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val)
 {
 	int i = 0;
-	int tmpval = 0;
+	u8 tmpval = 0;
 
 	if (stk_camera_write_reg(dev, STK_IIC_TX_INDEX, reg))
 		return 1;
@@ -253,7 +253,7 @@ static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val)
 static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val)
 {
 	int i = 0;
-	int tmpval = 0;
+	u8 tmpval = 0;
 
 	if (stk_camera_write_reg(dev, STK_IIC_RX_INDEX, reg))
 		return 1;
@@ -274,7 +274,7 @@ static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val)
 	if (stk_camera_read_reg(dev, STK_IIC_RX_VALUE, &tmpval))
 		return 1;
 
-	*val = (u8) tmpval;
+	*val = tmpval;
 	return 0;
 }
 

drivers/media/usb/stkwebcam/stk-webcam.c

@@ -144,7 +144,7 @@ int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
 		return 0;
 }
 
-int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
+int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value)
 {
 	struct usb_device *udev = dev->udev;
 	unsigned char *buf;
@@ -163,7 +163,7 @@ int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
 			sizeof(u8),
 			500);
 	if (ret >= 0)
-		memcpy(value, buf, sizeof(u8));
+		*value = *buf;
 
 	kfree(buf);
 	return ret;
@@ -171,9 +171,10 @@ int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value)
 
 static int stk_start_stream(struct stk_camera *dev)
 {
-	int value;
+	u8 value;
 	int i, ret;
-	int value_116, value_117;
+	u8 value_116, value_117;
+
 
 	if (!is_present(dev))
 		return -ENODEV;
@@ -213,7 +214,7 @@ static int stk_start_stream(struct stk_camera *dev)
 
 static int stk_stop_stream(struct stk_camera *dev)
 {
-	int value;
+	u8 value;
 	int i;
 	if (is_present(dev)) {
 		stk_camera_read_reg(dev, 0x0100, &value);

drivers/media/usb/stkwebcam/stk-webcam.h

@@ -129,7 +129,7 @@ struct stk_camera {
 #define vdev_to_camera(d) container_of(d, struct stk_camera, vdev)
 
 int stk_camera_write_reg(struct stk_camera *, u16, u8);
-int stk_camera_read_reg(struct stk_camera *, u16, int *);
+int stk_camera_read_reg(struct stk_camera *, u16, u8 *);
 
 int stk_sensor_init(struct stk_camera *);
 int stk_sensor_configure(struct stk_camera *);