V4L/DVB: ds3000: fix divide-by-zero error in ds3000_read_snr()

Fix a divide-by-zero error in ds3000's ds3000_read_snr(), when getting
a very low signal reading (dvbs2_signal_reading >= 1). This prevents
some nasty EIPs when running szap-s2 with a very low signal strength.

Signed-off-by: Nicolas Noirbent <nicolas.noirbent@smartjog.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/frontends/ds3000.c b/drivers/media/dvb/frontends/ds3000.c
index cff3535566fe2ed7234bdc5d4e8786cafc5ded70..78001e8bcdb74004c7930df01bcb1efa708ef922 100644 (file)
--- a/drivers/media/dvb/frontends/ds3000.c
+++ b/drivers/media/dvb/frontends/ds3000.c
@@ -719,7 +719,7 @@ static int ds3000_read_snr(struct dvb_frontend *fe, u16 *snr)
                                (ds3000_readreg(state, 0x8d) << 4);
                dvbs2_signal_reading = ds3000_readreg(state, 0x8e);
                tmp = dvbs2_signal_reading * dvbs2_signal_reading >> 1;
-               if (dvbs2_signal_reading == 0) {
+               if (tmp == 0) {
                        *snr = 0x0000;
                        return 0;
                }