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>

1 files changed, 22 insertions, 6 deletions

diff --git a/drivers/media/video/em28xx/em28xx-i2c.c b/drivers/media/video/em28xx/em28xx-i2c.c
index 2989a65f6917..3bab56b997fc 100644
--- a/drivers/media/video/em28xx/em28xx-i2c.c
+++ b/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);