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Commit 91f1ee65 authored by Wojciech Dubowik's avatar Wojciech Dubowik Committed by Kalle Valo
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ath9k: Fix airtime calculation for quarter/half channels 



The bitrate value for airtime calculation is specified for
full rates. We need to divide it for 5 and 10MHz channels to
get correct result.

Signed-off-by: default avatarWojciech Dubowik <Wojciech.Dubowik@neratec.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent 2571c081

drivers/net/wireless/ath/ath9k/hw.c

+4 −2
Original line number Diff line number Diff line
@@ -184,7 +184,8 @@ u16 ath9k_hw_computetxtime(struct ath_hw *ah, 
		break;

	case WLAN_RC_PHY_OFDM:

		if (ah->curchan && IS_CHAN_QUARTER_RATE(ah->curchan)) {

			bitsPerSymbol =	(kbps * OFDM_SYMBOL_TIME_QUARTER) / 1000;

			bitsPerSymbol =

				((kbps >> 2) * OFDM_SYMBOL_TIME_QUARTER) / 1000;

			numBits = OFDM_PLCP_BITS + (frameLen << 3);

			numSymbols = DIV_ROUND_UP(numBits, bitsPerSymbol);

			txTime = OFDM_SIFS_TIME_QUARTER
@@ -192,7 +193,8 @@ u16 ath9k_hw_computetxtime(struct ath_hw *ah, 
				+ (numSymbols * OFDM_SYMBOL_TIME_QUARTER);

		} else if (ah->curchan &&

			   IS_CHAN_HALF_RATE(ah->curchan)) {

			bitsPerSymbol =	(kbps * OFDM_SYMBOL_TIME_HALF) / 1000;

			bitsPerSymbol =

				((kbps >> 1) * OFDM_SYMBOL_TIME_HALF) / 1000;

			numBits = OFDM_PLCP_BITS + (frameLen << 3);

			numSymbols = DIV_ROUND_UP(numBits, bitsPerSymbol);

			txTime = OFDM_SIFS_TIME_HALF +