Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Authenticated-By: 
From:   Pkshih <pkshih@realtek.com>
To:     Nathan Chancellor <nathan@kernel.org>,
        Kalle Valo <kvalo@codeaurora.org>
CC:     Colin Ian King <colin.king@canonical.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "clang-built-linux@googlegroups.com" 
        <clang-built-linux@googlegroups.com>,
        "llvm@lists.linux.dev" <llvm@lists.linux.dev>
Subject: RE: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace()
Thread-Topic: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in
 _rtl92c_phy_get_rightchnlplace()
Thread-Index: AQHXmG0s5HBB1+4FIUaWbT4swfecM6uB4bug
Date:   Tue, 24 Aug 2021 01:45:25 +0000
Message-ID: <6ad224d9cd5545bebfaf2e60c54d359b@realtek.com>
References: <20210823222014.764557-1-nathan@kernel.org>
In-Reply-To: <20210823222014.764557-1-nathan@kernel.org>
Accept-Language: en-US, zh-TW
Content-Language: zh-TW
x-kse-attachmentfiltering-interceptor-info: no applicable attachment filtering
 rules found
x-kse-antivirus-interceptor-info: scan successful
x-kse-antivirus-info: =?us-ascii?Q?Clean,_bases:_2021/8/23_=3F=3F_11:22:00?=
x-kse-bulkmessagesfiltering-scan-result: protection disabled
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 8BIT
MIME-Version: 1.0
X-KSE-ServerInfo: RTEXH36502.realtek.com.tw, 9
X-KSE-Attachment-Filter-Triggered-Rules: Clean
X-KSE-Attachment-Filter-Triggered-Filters: Clean
X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled
X-KSE-AntiSpam-Outbound-Interceptor-Info: scan successful
X-KSE-AntiSpam-Version: 5.9.20, Database issued on: 08/24/2021 01:27:34
X-KSE-AntiSpam-Status: KAS_STATUS_NOT_DETECTED
X-KSE-AntiSpam-Method: none
X-KSE-AntiSpam-Rate: 0
X-KSE-AntiSpam-Info: Lua profiles 165744 [Aug 23 2021]
X-KSE-AntiSpam-Info: Version: 5.9.20.0
X-KSE-AntiSpam-Info: Envelope from: pkshih@realtek.com
X-KSE-AntiSpam-Info: LuaCore: 454 454 39c6e442fd417993330528e7f9d13ac1bf7fdf8c
X-KSE-AntiSpam-Info: {Tracking_uf_ne_domains}
X-KSE-AntiSpam-Info: {Tracking_from_domain_doesnt_match_to}
X-KSE-AntiSpam-Info: d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;realtek.com:7.1.1;127.0.0.199:7.1.2
X-KSE-AntiSpam-Info: Rate: 0
X-KSE-AntiSpam-Info: Status: not_detected
X-KSE-AntiSpam-Info: Method: none
X-KSE-AntiSpam-Info: Auth:dkim=none
X-KSE-Antiphishing-Info: Clean
X-KSE-Antiphishing-ScanningType: Heuristic
X-KSE-Antiphishing-Method: None
X-KSE-Antiphishing-Bases: 08/24/2021 01:29:00
Precedence: bulk
List-ID: <linux-wireless.vger.kernel.org>
X-Mailing-List: linux-wireless@vger.kernel.org


> -----Original Message-----
> From: Nathan Chancellor [mailto:nathan@kernel.org]
> Sent: Tuesday, August 24, 2021 6:20 AM
> To: Pkshih; Kalle Valo
> Cc: Colin Ian King; linux-wireless@vger.kernel.org; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; clang-built-linux@googlegroups.com; llvm@lists.linux.dev; Nathan
> Chancellor
> Subject: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace()
> 
> Clang warns:
> 
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:901:6: warning:
> variable 'place' is used uninitialized whenever 'if' condition is false
> [-Wsometimes-uninitialized]
>         if (chnl > 14) {
>             ^~~~~~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:909:9: note:
> uninitialized use occurs here
>         return place;
>                ^~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:901:2: note: remove
> the 'if' if its condition is always true
>         if (chnl > 14) {
>         ^~~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c:899:10: note:
> initialize the variable 'place' to silence this warning
>         u8 place;
>                 ^
>                  = '\0'
> 1 warning generated.
> 
> Commit 369956ae5720 ("rtlwifi: rtl8192de: Remove redundant variable
> initializations") removed the initialization of place but it appears
> that this removal was in the wrong function.

Somehow, I also look into wrong function.
Thanks for the catch.

> 
> _rtl92c_phy_get_rightchnlplace() returns place's value at the end of the
> function so now if the if statement is false, place never gets
> initialized. Add that initialization back to address the warning.
> 
> place's initialization is not necessary in
> rtl92d_get_rightchnlplace_for_iqk() as place is only used within the if
> statement so it can be removed, which is likely what was intended in the
> first place.
> 
> Fixes: 369956ae5720 ("rtlwifi: rtl8192de: Remove redundant variable initializations")
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Acked-by: Ping-Ke Shih <pkshih@realtek.com>

> ---
>  drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> index 8ae69d914312..9b83c710c9b8 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> @@ -896,7 +896,7 @@ static void _rtl92d_ccxpower_index_check(struct ieee80211_hw *hw,
> 
>  static u8 _rtl92c_phy_get_rightchnlplace(u8 chnl)
>  {
> -	u8 place;
> +	u8 place = chnl;
> 
>  	if (chnl > 14) {
>  		for (place = 14; place < sizeof(channel5g); place++) {
> @@ -1363,7 +1363,7 @@ static void _rtl92d_phy_switch_rf_setting(struct ieee80211_hw *hw, u8 channel)
> 
>  u8 rtl92d_get_rightchnlplace_for_iqk(u8 chnl)
>  {
> -	u8 place = chnl;
> +	u8 place;
> 
>  	if (chnl > 14) {
>  		for (place = 14; place < sizeof(channel_all); place++) {
> 
> base-commit: 609c1308fbc6446fd6d8fec42b80e157768a5362
> --
> 2.33.0