V4L/DVB (8937): em28xx: Fix and add some validations

Fixed and Added some validations
Signed-off-by: Douglas Schilling Landgraf <dougsland@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-i2c.c

@@ -336,8 +336,11 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 
 	/* Check if board has eeprom */
 	err = i2c_master_recv(&dev->i2c_client, &buf, 0);
-	if (err < 0)
-		return -1;
+	if (err < 0) {
+		em28xx_errdev("%s: i2c_master_recv failed! err [%d]\n",
+			__func__, err);
+		return err;
+	}
 
 	buf = 0;
 
@@ -345,7 +348,7 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 	if (err != 1) {
 		printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
 		       dev->name, err);
-		return -1;
+		return err;
 	}
 	while (size > 0) {
 		if (size > 16)
@@ -358,7 +361,7 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
 			printk(KERN_WARNING
 			       "%s: i2c eeprom read error (err=%d)\n",
 			       dev->name, err);
-			return -1;
+			return err;
 		}
 		size -= block;
 		p += block;
@@ -586,18 +589,31 @@ void em28xx_i2c_call_clients(struct em28xx *dev, unsigned int cmd, void *arg)
  */
 int em28xx_i2c_register(struct em28xx *dev)
 {
+	int retval;
+
 	BUG_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg);
 	BUG_ON(!dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req);
 	dev->i2c_adap = em28xx_adap_template;
 	dev->i2c_adap.dev.parent = &dev->udev->dev;
 	strcpy(dev->i2c_adap.name, dev->name);
 	dev->i2c_adap.algo_data = dev;
-	i2c_add_adapter(&dev->i2c_adap);
+
+	retval = i2c_add_adapter(&dev->i2c_adap);
+	if (retval < 0) {
+		em28xx_errdev("%s: i2c_add_adapter failed! retval [%d]\n",
+			__func__, retval);
+		return retval;
+	}
 
 	dev->i2c_client = em28xx_client_template;
 	dev->i2c_client.adapter = &dev->i2c_adap;
 
-	em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
+	retval = em28xx_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
+	if (retval < 0) {
+		em28xx_errdev("%s: em28xx_i2_eeprom failed! retval [%d]\n",
+			__func__, retval);
+		return retval;
+	}
 
 	if (i2c_scan)
 		em28xx_do_i2c_scan(dev);

drivers/media/video/em28xx/em28xx-video.c

@@ -513,10 +513,17 @@ static struct videobuf_queue_ops em28xx_video_qops = {
  */
 static int em28xx_config(struct em28xx *dev)
 {
+	int retval;
 
 	/* Sets I2C speed to 100 KHz */
-	if (!dev->is_em2800)
-		em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
+	if (!dev->is_em2800) {
+		retval = em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
+		if (retval < 0) {
+			em28xx_errdev("%s: em28xx_write_regs_req failed! retval [%d]\n",
+				__func__, retval);
+			return retval;
+		}
+	}
 
 	/* enable vbi capturing */
 
@@ -1953,13 +1960,23 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	}
 
 	/* register i2c bus */
-	em28xx_i2c_register(dev);
+	errCode = em28xx_i2c_register(dev);
+	if (errCode < 0) {
+		em28xx_errdev("%s: em28xx_i2c_register - errCode [%d]!\n",
+			__func__, errCode);
+		return errCode;
+	}
 
 	/* Do board specific init and eeprom reading */
 	em28xx_card_setup(dev);
 
 	/* Configure audio */
-	em28xx_audio_analog_set(dev);
+	errCode = em28xx_audio_analog_set(dev);
+	if (errCode < 0) {
+		em28xx_errdev("%s: em28xx_audio_analog_set - errCode [%d]!\n",
+			__func__, errCode);
+		return errCode;
+	}
 
 	/* configure the device */
 	em28xx_config_i2c(dev);
@@ -1979,6 +1996,11 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	dev->ctl_input = 2;
 
 	errCode = em28xx_config(dev);
+	if (errCode < 0) {
+		em28xx_errdev("%s: em28xx_config - errCode [%d]!\n",
+			__func__, errCode);
+		return errCode;
+	}
 
 	list_add_tail(&dev->devlist, &em28xx_devlist);
 
@@ -2031,9 +2053,20 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 
 	if (dev->has_msp34xx) {
 		/* Send a reset to other chips via gpio */
-		em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
+		errCode = em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
+		if (errCode < 0) {
+			em28xx_errdev("%s: em28xx_write_regs_req - msp34xx(1) failed! errCode [%d]\n",
+				__func__, errCode);
+			return errCode;
+		}
 		msleep(3);
-		em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
+
+		errCode = em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
+		if (errCode < 0) {
+			em28xx_errdev("%s: em28xx_write_regs_req - msp34xx(2) failed! errCode [%d]\n",
+				__func__, errCode);
+			return errCode;
+		}
 		msleep(3);
 	}