[media] lgdt330x: fix signedness error in i2c_read_demod_bytes()

The error handling in lgdt3303_read_status() and lgdt330x_read_ucblocks()
doesn't work, because i2c_read_demod_bytes() returns a u8 and (err < 0)
is always false.

        err = i2c_read_demod_bytes(state, 0x58, buf, 1);
        if (err < 0)
                return err;

Change the return type of i2c_read_demod_bytes() to int.  Also change
the return value on error to -EIO to make (err < 0) work.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/media/dvb/frontends/lgdt330x.c b/drivers/media/dvb/frontends/lgdt330x.c
index c990d35a13d..e046622df0e 100644
--- a/drivers/media/dvb/frontends/lgdt330x.c
+++ b/drivers/media/dvb/frontends/lgdt330x.c
@@ -104,8 +104,8 @@ static int i2c_write_demod_bytes (struct lgdt330x_state* state,
  * then reads the data returned for (len) bytes.
  */
 
-static u8 i2c_read_demod_bytes (struct lgdt330x_state* state,
-                               enum I2C_REG reg, u8* buf, int len)
+static int i2c_read_demod_bytes(struct lgdt330x_state *state,
+                                enum I2C_REG reg, u8 *buf, int len)
 {
         u8 wr [] = { reg };
         struct i2c_msg msg [] = {
@@ -118,6 +118,8 @@ static u8 i2c_read_demod_bytes (struct lgdt330x_state* state,
         ret = i2c_transfer(state->i2c, msg, 2);
         if (ret != 2) {
                 printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __func__, state->config->demod_address, reg, ret);
+                if (ret >= 0)
+                        ret = -EIO;
         } else {
                 ret = 0;
         }