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rtlwifi: rtl8821ae: Fix potential race condition 

Flag rfchange_inprogress in struct rtl_ps_ctl is protected by a spinlock
in most routines but not in rtl8821ae_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>
This commit is contained in:
Larry Finger 2016-06-25 13:37:47 -05:00 committed by Kalle Valo
parent 4f29b348bd
commit 300c32ca84
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/realtek/rtlwifi/rtl8821ae/dm.c
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@ -2949,6 +2949,7 @@ void rtl8821ae_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)) {
@ -2967,6 +2968,7 @@ void rtl8821ae_dm_watchdog(struct ieee80211_hw *hw)
rtl8821ae_dm_check_txpower_tracking_thermalmeter(hw);
rtl8821ae_dm_iq_calibrate(hw);
}
spin_unlock(&rtlpriv->locks.rf_ps_lock);
rtlpriv->dm.dbginfo.num_qry_beacon_pkt = 0;
RT_TRACE(rtlpriv, COMP_DIG, DBG_DMESG, "\n");