diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h b/drivers/net/wireless/realtek/rtlwifi/wifi.h
index fdccfd29f..a89e232d6 100755
--- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
+++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
@@ -3111,4 +3111,11 @@ 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