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Date: Sun, 05 Feb 2012 09:12:38 +0100
From: Jan Ceuleers <jan.ceuleers@...puter.org>
To: "Devendra.Naga" <devendra.aaru@...il.com>
CC: Larry.Finger@...inger.net, chaoming_li@...lsil.com.cn,
linville@...driver.com, paul.gortmaker@...driver.com,
joe@...ches.com, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] wireless: move ifs' in _rtl92c_store_pwrIndex_diffrate_offset
into elseif statements
On 01/30/2012 07:50 AM, Devendra.Naga wrote:
> From: "Devendra.Naga"<devendra.aaru@...il.com>
>
> The regaddr is compared against different rates in each case and the powerlevels are set
> accordingly. as this can match for the first if and we still check for other powerlevels too,
> use else if ratherthan using if statements
> Signed-off-by: Devendra.Naga<devendra.aaru@...il.com>
If this is correct, and I'm not saying it is or isn't, would it not be
clearer to turn this whole section into a switch statement? The cases
that requiring fiddling with the bitmask would need to be dealt with in
the default: case.
Why was it written as a series of if statements to begin with: can (or
could) any of these if statements change the value of regaddr such that
later ifs evaluate differently? From reading only the patch the answer
seems to be "no", so that looks good.
Or what about turning this into a data-driven section? It looks like
values of regaddr are being translated into offsets into
rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt]. Can this be done with a lookup
table?
> ---
> drivers/net/wireless/rtlwifi/rtl8192c/phy_common.c | 47 +++++++------------
> 1 files changed, 17 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/net/wireless/rtlwifi/rtl8192c/phy_common.c b/drivers/net/wireless/rtlwifi/rtl8192c/phy_common.c
> index 22e998d..cb11e5a 100644
> --- a/drivers/net/wireless/rtlwifi/rtl8192c/phy_common.c
> +++ b/drivers/net/wireless/rtlwifi/rtl8192c/phy_common.c
> @@ -260,106 +260,93 @@ void _rtl92c_store_pwrIndex_diffrate_offset(struct ieee80211_hw *hw,
> "MCSTxPowerLevelOriginalOffset[%d][0] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][0]);
> - }
> - if (regaddr == RTXAGC_A_RATE54_24) {
> + } else if (regaddr == RTXAGC_A_RATE54_24) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][1] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][1] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][1]);
> - }
> - if (regaddr == RTXAGC_A_CCK1_MCS32) {
> + } else if (regaddr == RTXAGC_A_CCK1_MCS32) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][6] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][6] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][6]);
> - }
> - if (regaddr == RTXAGC_B_CCK11_A_CCK2_11&& bitmask == 0xffffff00) {
> + } else if (regaddr == RTXAGC_B_CCK11_A_CCK2_11&&
> + bitmask == 0xffffff00) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][7] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][7] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][7]);
> - }
> - if (regaddr == RTXAGC_A_MCS03_MCS00) {
> + } else if (regaddr == RTXAGC_A_MCS03_MCS00) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][2] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][2] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][2]);
> - }
> - if (regaddr == RTXAGC_A_MCS07_MCS04) {
> + } else if (regaddr == RTXAGC_A_MCS07_MCS04) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][3] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][3] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][3]);
> - }
> - if (regaddr == RTXAGC_A_MCS11_MCS08) {
> + } else if (regaddr == RTXAGC_A_MCS11_MCS08) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][4] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][4] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][4]);
> - }
> - if (regaddr == RTXAGC_A_MCS15_MCS12) {
> + } else if (regaddr == RTXAGC_A_MCS15_MCS12) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][5] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][5] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][5]);
> - }
> - if (regaddr == RTXAGC_B_RATE18_06) {
> + } else if (regaddr == RTXAGC_B_RATE18_06) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][8] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][8] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][8]);
> - }
> - if (regaddr == RTXAGC_B_RATE54_24) {
> + } else if (regaddr == RTXAGC_B_RATE54_24) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][9] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][9] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][9]);
> - }
> - if (regaddr == RTXAGC_B_CCK1_55_MCS32) {
> + } else if (regaddr == RTXAGC_B_CCK1_55_MCS32) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][14] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][14] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][14]);
> - }
> - if (regaddr == RTXAGC_B_CCK11_A_CCK2_11&& bitmask == 0x000000ff) {
> + } else if (regaddr == RTXAGC_B_CCK11_A_CCK2_11&&
> + bitmask == 0x000000ff) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][15] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][15] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][15]);
> - }
> - if (regaddr == RTXAGC_B_MCS03_MCS00) {
> + } else if (regaddr == RTXAGC_B_MCS03_MCS00) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][10] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][10] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][10]);
> - }
> - if (regaddr == RTXAGC_B_MCS07_MCS04) {
> + } else if (regaddr == RTXAGC_B_MCS07_MCS04) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][11] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][11] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][11]);
> - }
> - if (regaddr == RTXAGC_B_MCS11_MCS08) {
> + } else if (regaddr == RTXAGC_B_MCS11_MCS08) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][12] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][12] = 0x%x\n",
> rtlphy->pwrgroup_cnt,
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][12]);
> - }
> - if (regaddr == RTXAGC_B_MCS15_MCS12) {
> + } else if (regaddr == RTXAGC_B_MCS15_MCS12) {
> rtlphy->MCS_TXPWR[rtlphy->pwrgroup_cnt][13] = data;
> RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,
> "MCSTxPowerLevelOriginalOffset[%d][13] = 0x%x\n",
--
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