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ath9k: fix bug in tx power

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The ath9k driver subtracts 3 dBm to the txpower as with two radios the
signal power is doubled.
The resulting value is assigned in an u16 which overflows and makes
the card work at full power.

Cc: stable@kernel.org
Signed-off-by: Matteo Croce <matteo@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Matteo Croce 2010-12-03 02:25:08 +01:00 committed by John W. Linville
parent d89197c7f3
commit 841051602e
1 changed files with 8 additions and 4 deletions
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12
drivers/net/wireless/ath/ath9k/eeprom_def.c
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@ -1063,15 +1063,19 @@ static void ath9k_hw_set_def_power_per_rate_table(struct ath_hw *ah,
case 1: case 1:
break; break;
case 2: case 2:
scaledPower -= REDUCE_SCALED_POWER_BY_TWO_CHAIN; if (scaledPower > REDUCE_SCALED_POWER_BY_TWO_CHAIN)
scaledPower -= REDUCE_SCALED_POWER_BY_TWO_CHAIN;
else
scaledPower = 0;
break; break;
case 3: case 3:
scaledPower -= REDUCE_SCALED_POWER_BY_THREE_CHAIN; if (scaledPower > REDUCE_SCALED_POWER_BY_THREE_CHAIN)
scaledPower -= REDUCE_SCALED_POWER_BY_THREE_CHAIN;
else
scaledPower = 0;
break; break;
} }
scaledPower = max((u16)0, scaledPower);
if (IS_CHAN_2GHZ(chan)) { if (IS_CHAN_2GHZ(chan)) {
numCtlModes = ARRAY_SIZE(ctlModesFor11g) - numCtlModes = ARRAY_SIZE(ctlModesFor11g) -
SUB_NUM_CTL_MODES_AT_2G_40; SUB_NUM_CTL_MODES_AT_2G_40;