rtlwifi: rtl8723ae: Fix potential race condition

Flag rfchange_inprogress in struct rtl_ps_ctl is protected by a spinlock
in most routines but not in rtl8723e_dm_watchdog(), which could
lead to a race condition. The necessary locking to prevent this condition
is added.

Reported-by: Pavel Andrianov <andrianov@ispras.ru>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Pavel Andrianov <andrianov@ispras.ru>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/dm.c b/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/dm.c
index 4c1c96c96a5a3d5bc0113fa9f11c868a40c24fee..3900e106de31a74036caf7a7e5f6fbaaf7425d08 100644 (file)
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/dm.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8723ae/dm.c
@@ -816,6 +816,7 @@ void rtl8723e_dm_watchdog(struct ieee80211_hw *hw)
        if (ppsc->p2p_ps_info.p2p_ps_mode)
                fw_ps_awake = false;
 
+       spin_lock(&rtlpriv->locks.rf_ps_lock);
        if ((ppsc->rfpwr_state == ERFON) &&
            ((!fw_current_inpsmode) && fw_ps_awake) &&
            (!ppsc->rfchange_inprogress)) {
@@ -829,6 +830,7 @@ void rtl8723e_dm_watchdog(struct ieee80211_hw *hw)
                rtl8723e_dm_bt_coexist(hw);
                rtl8723e_dm_check_edca_turbo(hw);
        }
+       spin_unlock(&rtlpriv->locks.rf_ps_lock);
        if (rtlpriv->btcoexist.init_set)
                rtl_write_byte(rtlpriv, 0x76e, 0xc);
 }