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From: Nathan Chancellor <nathan@kernel.org>
To: Ping-Ke Shih <pkshih@realtek.com>, Kalle Valo <kvalo@codeaurora.org>
Cc: Colin Ian King <colin.king@canonical.com>,
	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 <nathan@kernel.org>
Subject: [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace()
Date: Mon, 23 Aug 2021 15:20:14 -0700	[thread overview]
Message-ID: <20210823222014.764557-1-nathan@kernel.org> (raw)

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.

_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>
---
 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


             reply	other threads:[~2021-08-23 22:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 22:20 Nathan Chancellor [this message]
2021-08-24  1:45 ` [PATCH] rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace() Pkshih
2021-08-24  1:45   ` Pkshih
2021-08-26  2:36 ` Kees Cook
2021-08-29  7:28 ` Kalle Valo
2021-08-29  7:28 ` Kalle Valo

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