ath5k: Track current TX power separately from max TX power

Add a new variable to keep track of the currently configured tx power. Before
max_pwr was re-used for keeping the maximum allowed power as well as the
current configuration. Doing a min() on it allows you to lower the txpower, but
how would you be able to make it higher again?

This patch fixes that by adding a new variable ah_cur_pwr which is used instead
of txp_max_pwr to keep the current configuration. txp_max_pwr is used to check
if we are within the limits.

Another problem fixed by this patch is that it avoids setting a zero txpower
when things are initialized first and the current power is not yet set.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
index e6491bf359c0..342da280c987 100644
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -1107,6 +1107,7 @@ struct ath5k_hw {
                 /* Values in 0.25dB units */
                 s16             txp_min_pwr;
                 s16             txp_max_pwr;
+                s16             txp_cur_pwr;
                 /* Values in 0.5dB units */
                 s16             txp_offset;
                 s16             txp_ofdm;
diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index 6f0cf3a09b2c..18c58cdfde46 100644
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -3096,7 +3096,7 @@ ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr,
 
         /* Min/max in 0.25dB units */
         ah->ah_txpower.txp_min_pwr = 2 * rates[7];
-        ah->ah_txpower.txp_max_pwr = 2 * rates[0];
+        ah->ah_txpower.txp_cur_pwr = 2 * rates[0];
         ah->ah_txpower.txp_ofdm = rates[7];
 }
 
@@ -3150,8 +3150,6 @@ ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                 /* Reset TX power values */
                 memset(&ah->ah_txpower, 0, sizeof(ah->ah_txpower));
                 ah->ah_txpower.txp_tpc = AR5K_TUNE_TPC_TXPOWER;
-                ah->ah_txpower.txp_min_pwr = 0;
-                ah->ah_txpower.txp_max_pwr = AR5K_TUNE_MAX_TXPOWER;
 
                 /* Calculate the powertable */
                 ret = ath5k_setup_channel_powertable(ah, channel,
@@ -3290,7 +3288,8 @@ int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
          * properly set curve indices.
          */
         ret = ath5k_hw_txpower(ah, channel, ee_mode,
-                                ah->ah_txpower.txp_max_pwr / 2);
+                ah->ah_txpower.txp_cur_pwr ?
+                        ah->ah_txpower.txp_cur_pwr / 2 : AR5K_TUNE_MAX_TXPOWER);
         if (ret)
                 return ret;