From 52221dfddbbfb5b4e029bb2efe9bb7da33ec1e46 Mon Sep 17 00:00:00 2001 From: Su Hui Date: Tue, 19 Dec 2023 14:57:29 +0800 Subject: 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 Acked-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://msgid.link/20231219065739.1895666-2-suhui@nfschina.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 ac8dfda7099d..d87cd2252eac 100644 --- a/drivers/net/wireless/realtek/rtlwifi/wifi.h +++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h @@ -3052,4 +3052,11 @@ 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 -- cgit v1.2.3-58-ga151