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

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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>
This commit is contained in:
Nicolas Noirbent 2010-03-22 14:54:43 -03:00 committed by Mauro Carvalho Chehab
parent b4bc3dcbef
commit 450df22286
1 changed files with 1 additions and 1 deletions
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2
drivers/media/dvb/frontends/ds3000.c
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@ -719,7 +719,7 @@ static int ds3000_read_snr(struct dvb_frontend *fe, u16 *snr)
(ds3000_readreg(state, 0x8d) << 4); (ds3000_readreg(state, 0x8d) << 4);
dvbs2_signal_reading = ds3000_readreg(state, 0x8e); dvbs2_signal_reading = ds3000_readreg(state, 0x8e);
tmp = dvbs2_signal_reading * dvbs2_signal_reading >> 1; tmp = dvbs2_signal_reading * dvbs2_signal_reading >> 1;
if (dvbs2_signal_reading == 0) { if (tmp == 0) {
*snr = 0x0000; *snr = 0x0000;
return 0; return 0;
} }