Return-path: Received: from mail-we0-f174.google.com ([74.125.82.174]:36323 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752387Ab2G1OdO (ORCPT ); Sat, 28 Jul 2012 10:33:14 -0400 Received: by weyx8 with SMTP id x8so2692055wey.19 for ; Sat, 28 Jul 2012 07:33:13 -0700 (PDT) From: Nick Kossifidis To: ath5k-devel@lists.ath5k.org, linux-wireless@vger.kernel.org Cc: linville@tuxdriver.com, mcgrof@gmail.com, jirislaby@gmail.com, thomas@net.t-labs.tu-berlin.de, nbd@openwrt.org, Nick Kossifidis Subject: [PATCH 2/4] ath5k: Fix range scaling when setting rate power table Date: Sat, 28 Jul 2012 17:32:49 +0300 Message-Id: <1343485971-31360-2-git-send-email-mickflemm@gmail.com> (sfid-20120728_163351_008780_20A9BE89) In-Reply-To: <1343485971-31360-1-git-send-email-mickflemm@gmail.com> References: <1343485971-31360-1-git-send-email-mickflemm@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: rates[i] is unsigned but txp_offset can be negative for newer parts with PDADC table. We cover the case when rates[i] + txp_offset > 63 but we must also cover the case when its < 0 or else rates[i] will underflow. Signed-off-by: Nick Kossifidis --- drivers/net/wireless/ath/ath5k/phy.c | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c index aa1a77d..84a9aaf 100644 --- a/drivers/net/wireless/ath/ath5k/phy.c +++ b/drivers/net/wireless/ath/ath5k/phy.c @@ -3516,6 +3516,7 @@ ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr, { unsigned int i; u16 *rates; + s16 rate_idx_scaled = 0; /* max_pwr is power level we got from driver/user in 0.5dB * units, switch to 0.25dB units so we can compare */ @@ -3580,10 +3581,13 @@ ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr, * match the power range set by user with the power indices * on PCDAC/PDADC table */ for (i = 0; i < 16; i++) { - rates[i] += ah->ah_txpower.txp_offset; + rate_idx_scaled = rates[i] + ah->ah_txpower.txp_offset; /* Don't get out of bounds */ - if (rates[i] > 63) - rates[i] = 63; + if (rate_idx_scaled > 63) + rate_idx_scaled = 63; + if (rate_idx_scaled < 0) + rate_idx_scaled = 0; + rates[i] = rate_idx_scaled; } } -- 1.7.3.4