ath9k: Fix deadlock while updating p2p beacon timer

pm_lock is taken twice while syncing HW TSF of p2p vif.
Fix this by taking the lock at caller side.

Cc: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 6965cea..40791db 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1757,7 +1757,6 @@ out:
 void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
 {
        struct ath_vif *avp = (void *)vif->drv_priv;
-       unsigned long flags;
        u32 tsf;
 
        if (!sc->p2p_ps_timer)
@@ -1767,14 +1766,9 @@ void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
                return;
 
        sc->p2p_ps_vif = avp;
-
-       spin_lock_irqsave(&sc->sc_pm_lock, flags);
-       if (!(sc->ps_flags & PS_BEACON_SYNC)) {
-               tsf = ath9k_hw_gettsf32(sc->sc_ah);
-               ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
-               ath9k_update_p2p_ps_timer(sc, avp);
-       }
-       spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+       tsf = ath9k_hw_gettsf32(sc->sc_ah);
+       ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
+       ath9k_update_p2p_ps_timer(sc, avp);
 }
 
 static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
@@ -1791,6 +1785,7 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        struct ath_vif *avp = (void *)vif->drv_priv;
+       unsigned long flags;
        int slottime;
 
        ath9k_ps_wakeup(sc);
@@ -1853,7 +1848,10 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
 
        if (changed & BSS_CHANGED_P2P_PS) {
                spin_lock_bh(&sc->sc_pcu_lock);
-               ath9k_update_p2p_ps(sc, vif);
+               spin_lock_irqsave(&sc->sc_pm_lock, flags);
+               if (!(sc->ps_flags & PS_BEACON_SYNC))
+                       ath9k_update_p2p_ps(sc, vif);
+               spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
                spin_unlock_bh(&sc->sc_pcu_lock);
        }