From patchwork Tue Dec 19 06:57:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Su Hui X-Patchwork-Id: 13497909 X-Patchwork-Delegate: kvalo@adurom.com Received: from mail.nfschina.com (unknown [42.101.60.195]) by smtp.subspace.kernel.org (Postfix) with SMTP id 78E0011709; Tue, 19 Dec 2023 06:58:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=nfschina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nfschina.com Received: from localhost.localdomain (unknown [180.167.10.98]) by mail.nfschina.com (Maildata Gateway V2.8.8) with ESMTPSA id B484B60F259C1; Tue, 19 Dec 2023 14:57:54 +0800 (CST) X-MD-Sfrom: suhui@nfschina.com X-MD-SrcIP: 180.167.10.98 From: Su Hui To: pkshih@realtek.com, kvalo@kernel.org Cc: Su Hui , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH wireless-next 01/11] wifi: rtlwifi: add calculate_bit_shift() Date: Tue, 19 Dec 2023 14:57:29 +0800 Message-Id: <20231219065739.1895666-2-suhui@nfschina.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231219065739.1895666-1-suhui@nfschina.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There are many same functions like _rtl88e_phy_calculate_bit_shift(), _rtl92c_phy_calculate_bit_shift() and so on. And these functions can cause undefined bitwise shift behavior. Add calculate_bit_shift() to replace them and fix undefined behavior in subsequent patches. Signed-off-by: Su Hui Acked-by: Ping-Ke Shih --- drivers/net/wireless/realtek/rtlwifi/wifi.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h b/drivers/net/wireless/realtek/rtlwifi/wifi.h index 31a481f43a07..5d842cc394aa 100644 --- a/drivers/net/wireless/realtek/rtlwifi/wifi.h +++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h @@ -3069,4 +3069,11 @@ static inline struct ieee80211_sta *rtl_find_sta(struct ieee80211_hw *hw, return ieee80211_find_sta(mac->vif, mac_addr); } +static inline u32 calculate_bit_shift(u32 bitmask) +{ + if (WARN_ON_ONCE(!bitmask)) + return 0; + + return __ffs(bitmask); +} #endif