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media: ts2020: avoid integer overflows on 32 bit machines
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
Cc: stable@vger.kernel.org
Fixes: 0f91c9d6ba
("[media] TS2020: Calculate tuner gain correctly")
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
parent
4852fdca88
commit
81742be14b
1 changed files with 2 additions and 2 deletions
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@ -368,7 +368,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
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gain2 = clamp_t(long, gain2, 0, 13);
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v_agc = clamp_t(long, v_agc, 400, 1100);
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*_gain = -(gain1 * 2330 +
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*_gain = -((__s64)gain1 * 2330 +
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gain2 * 3500 +
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v_agc * 24 / 10 * 10 +
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10000);
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@ -386,7 +386,7 @@ static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
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gain3 = clamp_t(long, gain3, 0, 6);
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v_agc = clamp_t(long, v_agc, 600, 1600);
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*_gain = -(gain1 * 2650 +
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*_gain = -((__s64)gain1 * 2650 +
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gain2 * 3380 +
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gain3 * 2850 +
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v_agc * 176 / 100 * 10 -
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