linux-kernel - RE: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get

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Date:   Tue, 24 Aug 2021 01:45:25 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>
CC:     Colin Ian King <colin.king@...onical.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: RE: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace()


> -----Original Message-----
> From: Nathan Chancellor [mailto:nathan@...nel.org]
> Sent: Tuesday, August 24, 2021 6:20 AM
> To: Pkshih; Kalle Valo
> Cc: Colin Ian King; linux-wireless@...r.kernel.org; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org; clang-built-linux@...glegroups.com; llvm@...ts.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@...nel.org>

Acked-by: Ping-Ke Shih <pkshih@...ltek.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