[media] em28xx: do not interpret eeprom content if eeprom key is invalid

If the eeprom key isn't valid, either a different (currently unknown) format
is used or the eeprom is corrupted.
In both cases it doesn't make sense to interpret the data.
Also print an error message.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c
index b8e9946f8452b676474aef767dc37e42f32f842a..b8a9bee836fafbfc1c8255c104ca4d82ea291271 100644 (file)
--- a/drivers/media/usb/em28xx/em28xx-i2c.c
+++ b/drivers/media/usb/em28xx/em28xx-i2c.c
@@ -434,8 +434,12 @@ static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned char *eedata, int len)
                        printk("\n");
        }
 
-       if (em_eeprom->id == 0x9567eb1a)
-               dev->hash = em28xx_hash_mem(eedata, len, 32);
+       if (em_eeprom->id != 0x9567eb1a) {
+               em28xx_errdev("Unknown eeprom type or eeprom corrupted !");
+               return -ENODEV;
+       }
+
+       dev->hash = em28xx_hash_mem(eedata, len, 32);
 
        em28xx_info("EEPROM ID = 0x%08x, EEPROM hash = 0x%08lx\n",
                    em_eeprom->id, dev->hash);