diff --git a/drivers/net/wireless/realtek/rtw89/ser.c b/drivers/net/wireless/realtek/rtw89/ser.c
index 74af916ac742..1f919854beb1 100644
--- a/drivers/net/wireless/realtek/rtw89/ser.c
+++ b/drivers/net/wireless/realtek/rtw89/ser.c
@@ -153,7 +153,10 @@ static void ser_state_run(struct rtw89_ser *ser, u8 evt)
 	rtw89_debug(rtwdev, RTW89_DBG_SER, "ser: %s receive %s\n",
 		    ser_st_name(ser), ser_ev_name(ser, evt));
 
+	mutex_lock(&rtwdev->mutex);
 	rtw89_leave_lps(rtwdev);
+	mutex_unlock(&rtwdev->mutex);
+
 	ser->st_tbl[ser->state].st_func(ser, evt);
 }