From: Rajkumar Manoharan Date: Tue, 27 May 2014 11:28:02 +0000 (+0530) Subject: ath9k: Fix deadlock while updating p2p beacon timer X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=60ccc107c9b9fb732fdee1f76bb2dad44f0e1798;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Signed-off-by: Rajkumar Manoharan Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 6965ceac7bc6..40791dbf4616 100644 --- 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); }