diff --git a/drivers/media/usb/cx231xx/cx231xx-avcore.c b/drivers/media/usb/cx231xx/cx231xx-avcore.c
index 447148eff958..d34dbcf834c7 100644
--- a/drivers/media/usb/cx231xx/cx231xx-avcore.c
+++ b/drivers/media/usb/cx231xx/cx231xx-avcore.c
@@ -1068,12 +1068,12 @@ int cx231xx_unmute_audio(struct cx231xx *dev)
 }
 EXPORT_SYMBOL_GPL(cx231xx_unmute_audio);
 
-int stopAudioFirmware(struct cx231xx *dev)
+static int stopAudioFirmware(struct cx231xx *dev)
 {
 	return vid_blk_write_byte(dev, DL_CTL_CONTROL, 0x03);
 }
 
-int restartAudioFirmware(struct cx231xx *dev)
+static int restartAudioFirmware(struct cx231xx *dev)
 {
 	return vid_blk_write_byte(dev, DL_CTL_CONTROL, 0x13);
 }
diff --git a/drivers/media/usb/cx231xx/cx231xx-cards.c b/drivers/media/usb/cx231xx/cx231xx-cards.c
index b84ebc54d91b..bbed1e40eeda 100644
--- a/drivers/media/usb/cx231xx/cx231xx-cards.c
+++ b/drivers/media/usb/cx231xx/cx231xx-cards.c
@@ -686,7 +686,7 @@ int cx231xx_tuner_callback(void *ptr, int component, int command, int arg)
 }
 EXPORT_SYMBOL_GPL(cx231xx_tuner_callback);
 
-void cx231xx_reset_out(struct cx231xx *dev)
+static void cx231xx_reset_out(struct cx231xx *dev)
 {
 	cx231xx_set_gpio_value(dev, CX23417_RESET, 1);
 	msleep(200);
@@ -694,11 +694,13 @@ void cx231xx_reset_out(struct cx231xx *dev)
 	msleep(200);
 	cx231xx_set_gpio_value(dev, CX23417_RESET, 1);
 }
-void cx231xx_enable_OSC(struct cx231xx *dev)
+
+static void cx231xx_enable_OSC(struct cx231xx *dev)
 {
 	cx231xx_set_gpio_value(dev, CX23417_OSC_EN, 1);
 }
-void cx231xx_sleep_s5h1432(struct cx231xx *dev)
+
+static void cx231xx_sleep_s5h1432(struct cx231xx *dev)
 {
 	cx231xx_set_gpio_value(dev, SLEEP_S5H1432, 0);
 }
diff --git a/drivers/media/usb/cx231xx/cx231xx-i2c.c b/drivers/media/usb/cx231xx/cx231xx-i2c.c
index 781feed406f7..96a5a0965399 100644
--- a/drivers/media/usb/cx231xx/cx231xx-i2c.c
+++ b/drivers/media/usb/cx231xx/cx231xx-i2c.c
@@ -72,8 +72,8 @@ static inline bool is_tuner(struct cx231xx *dev, struct cx231xx_i2c *bus,
 /*
  * cx231xx_i2c_send_bytes()
  */
-int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
-			   const struct i2c_msg *msg)
+static int cx231xx_i2c_send_bytes(struct i2c_adapter *i2c_adap,
+				  const struct i2c_msg *msg)
 {
 	struct cx231xx_i2c *bus = i2c_adap->algo_data;
 	struct cx231xx *dev = bus->dev;