linux-kernel - [PATCH wireless-next 01/11] wifi: rtlwifi: add calculate_bit

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Message-Id: <20231219065739.1895666-2-suhui@nfschina.com>
Date: Tue, 19 Dec 2023 14:57:29 +0800
From: Su Hui <suhui@...china.com>
To: pkshih@...ltek.com,
	kvalo@...nel.org
Cc: Su Hui <suhui@...china.com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH wireless-next 01/11] wifi: rtlwifi: add calculate_bit_shift()

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 <suhui@...china.com>
---
 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
-- 
2.30.2