diff options
| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-01-10 15:20:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-16 22:09:45 +0300 |
| commit | 6b3bfe719b65a19349c65ef112ad61e64b7068c0 (patch) | |
| tree | 6ffcf784a8b5ea992457b056bd6166d87d732ac8 | |
| parent | febb867324cb97d82645a32f94d1ac11ce1a00f5 (diff) | |
| download | linux-6b3bfe719b65a19349c65ef112ad61e64b7068c0.tar.xz | |
media: ts2020: avoid integer overflows on 32 bit machines
commit 81742be14b6a90c9fd0ff6eb4218bdf696ad8e46 upstream.
Before this patch, when compiled for arm32, the signal strength
were reported as:
Lock (0x1f) Signal= 4294908.66dBm C/N= 12.79dB
Because of a 32 bit integer overflow. After it, it is properly
reported as:
Lock (0x1f) Signal= -58.64dBm C/N= 12.79dB
Fixes: 0f91c9d6bab9 ("[media] TS2020: Calculate tuner gain correctly")
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/dvb-frontends/ts2020.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c index 7979e5d6498b..7ca359391535 100644 --- a/drivers/media/dvb-frontends/ts2020.c +++ b/drivers/media/dvb-frontends/ts2020.c @@ -369,7 +369,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc, gain2 = clamp_t(long, gain2, 0, 13); v_agc = clamp_t(long, v_agc, 400, 1100); - *_gain = -(gain1 * 2330 + + *_gain = -((__s64)gain1 * 2330 + gain2 * 3500 + v_agc * 24 / 10 * 10 + 10000); @@ -387,7 +387,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc, gain3 = clamp_t(long, gain3, 0, 6); v_agc = clamp_t(long, v_agc, 600, 1600); - *_gain = -(gain1 * 2650 + + *_gain = -((__s64)gain1 * 2650 + gain2 * 3380 + gain3 * 2850 + v_agc * 176 / 100 * 10 - |