[PATCH] media/lgdt3306a: Add a missing return value check.

[Aditya Pakki]

In lgdt3306a.c, lgdt3306a_read_signal_strength() can fail while reading
the registers via lgdt3306a_read_reg(). The function can return an error
from i2c_transfer(). The fix checks the return value for this failure.

Signed-off-by: Aditya Pakki <pakki...@umn.edu>
---
 drivers/media/dvb-frontends/lgdt3306a.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/lgdt3306a.c 
b/drivers/media/dvb-frontends/lgdt3306a.c
index 0e1f5daaf20c..b79f652d05e1 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -1685,7 +1685,10 @@ static int lgdt3306a_read_signal_strength(struct 
dvb_frontend *fe,
        case QAM_256:
        case QAM_AUTO:
                /* need to know actual modulation to set proper SNR baseline */
-               lgdt3306a_read_reg(state, 0x00a6, &val);
+               ret = lgdt3306a_read_reg(state, 0x00a6, &val);
+               if (lg_chkerr(ret))
+                       goto fail;
+
                if(val & 0x04)
                        ref_snr = 2800; /* QAM-256 28dB */
                else
-- 
2.17.1