Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753011AbaFGPYX (ORCPT ); Sat, 7 Jun 2014 11:24:23 -0400 Received: from mail-oa0-f44.google.com ([209.85.219.44]:34486 "EHLO mail-oa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752954AbaFGPYU (ORCPT ); Sat, 7 Jun 2014 11:24:20 -0400 MIME-Version: 1.0 In-Reply-To: <1670424.dXK6NPb10R@al> References: <1402151419-18296-1-git-send-email-rickard_strandqvist@spectrumdigital.se> <1670424.dXK6NPb10R@al> Date: Sat, 7 Jun 2014 17:24:19 +0200 Message-ID: Subject: Re: [PATCH] net: wireless: rtlwifi: rtl8192de: hw.c: Cleaning up conjunction always evaluates to false From: Rickard Strandqvist To: Peter Wu Cc: Larry Finger , Chaoming Li , "John W. Linville" , linux-wireless@vger.kernel.org, Network Development , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! Yes, 0x3 was one of the most likely :) But wanted someone who knows the code better would be heard. All agreed? Then I do a new patch. Looks like it is the same error in the files below, I'll fix them all them to. rtl8192cu/hw.c:1363: if ((bt_msr & 0xfc) == MSR_AP) rtl8192ce/hw.c:1209: if ((bt_msr & 0xfc) == MSR_AP) rtl8188ee/hw.c:1234: if ((bt_msr & 0xfc) == MSR_AP) rtl8192de/hw.c:1131: if ((bt_msr & 0xfc) == MSR_AP) Best regards Rickard Strandqvist 2014-06-07 17:02 GMT+02:00 Peter Wu : > On Saturday 07 June 2014 16:30:19 Rickard Strandqvist wrote: >> Expression '(X & 0xfc) == 0x3' is always false > > While this is true, I believe that some other mistake is made. > >> I chose to remove this code, because it will not make any difference. >> But obviously it is rather a properly designed if statement that is needed. >> >> This was partly found using a static code analysis program called cppcheck. >> >> Signed-off-by: Rickard Strandqvist >> --- >> drivers/net/wireless/rtlwifi/rtl8192de/hw.c | 5 +---- >> 1 file changed, 1 insertion(+), 4 deletions(-) >> >> diff --git a/drivers/net/wireless/rtlwifi/rtl8192de/hw.c b/drivers/net/wireless/rtlwifi/rtl8192de/hw.c >> index 2b08671..a1520d5 100644 >> --- a/drivers/net/wireless/rtlwifi/rtl8192de/hw.c >> +++ b/drivers/net/wireless/rtlwifi/rtl8192de/hw.c >> @@ -1128,10 +1128,7 @@ static int _rtl92de_set_media_status(struct ieee80211_hw *hw, >> } >> rtl_write_byte(rtlpriv, REG_CR + 2, bt_msr); >> rtlpriv->cfg->ops->led_control(hw, ledaction); >> - if ((bt_msr & 0xfc) == MSR_AP) > > If you look a few lines up, then you see that bt_msr is OR-ed with MSR_AP > for AP interfaces. The 0xfc should be 0x03, see other drivers for example: > > rtl8723ae/hw.c:1112: if ((bt_msr & 0x03) == MSR_AP) > rtl8723be/hw.c:1200: if ((bt_msr & 0x03) == MSR_AP) > rtl8192cu/hw.c:1363: if ((bt_msr & 0xfc) == MSR_AP) > rtl8192ce/hw.c:1209: if ((bt_msr & 0xfc) == MSR_AP) > rtl8188ee/hw.c:1234: if ((bt_msr & 0xfc) == MSR_AP) > rtl8192de/hw.c:1131: if ((bt_msr & 0xfc) == MSR_AP) > >> - rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x00); >> - else >> - rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66); >> + rtl_write_byte(rtlpriv, REG_BCNTCFG + 1, 0x66); >> return 0; >> } > > Kind regards, > Peter > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/