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ath9k: fix two more bugs in tx power 

This is the same fix as

   commit 841051602e
   Author: Matteo Croce <technoboy85@gmail.com>
   Date:   Fri Dec 3 02:25:08 2010 +0100

   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.

in two more places. I grepped the ath tree and didn't find any others.

Cc: stable@kernel.org
Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Halperin 2011-05-31 11:59:30 -07:00 committed by John W. Linville
parent 333ba73252
commit 21fdc87248
2 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
View File

@ -4645,10 +4645,16 @@ static void ar9003_hw_set_power_per_rate_table(struct ath_hw *ah,
case 1:
break;
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;
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;
}

10
drivers/net/wireless/ath/ath9k/eeprom_9287.c
View File

@ -524,10 +524,16 @@ static void ath9k_hw_set_ar9287_power_per_rate_table(struct ath_hw *ah,
case 1:
break;
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;
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;
}
scaledPower = max((u16)0, scaledPower);