From: Luis R. Rodriguez Date: Tue, 7 Dec 2010 23:13:19 +0000 (-0800) Subject: ath9k: Fix power save count imbalance on ath_radio_enable() X-Git-Tag: v3.0~2504^2~14^2~3^2~179 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c2731b814e2aaaa40072ee761b7373c052d86e37;p=platform%2Fkernel%2Flinux-amlogic.git ath9k: Fix power save count imbalance on ath_radio_enable() Upon a failure we never call ath9k_ps_restore() on ath_radio_enable(), this will throw off the sc->ps_usecount. When the sc->ps_usecount is > 0 we never put the chip to full sleep. This drains battery, and will also make the chip fail upon resume with: ath: Starting driver with initial channel: 5745 MHz ath: timeout (100000 us) on reg 0x7000: 0xdeadbeef & 0x00000003 != 0x00000000 This would make the chip useless upon resume. I cannot prove this can happen but in theory it is so best to avoid this race completely and not have users complain about a broken device after resume. Cc: stable@kernel.org Cc: Paul Stewart Cc: Amod Bodas Signed-off-by: Luis R. Rodriguez 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 daa3c9f..ef298f4 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -900,8 +900,7 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) ath_update_txpow(sc); if (ath_startrecv(sc) != 0) { ath_err(common, "Unable to restart recv logic\n"); - spin_unlock_bh(&sc->sc_pcu_lock); - return; + goto out; } if (sc->sc_flags & SC_OP_BEACONS) ath_beacon_config(sc, NULL); /* restart beacons */ @@ -915,6 +914,7 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) ath9k_hw_set_gpio(ah, ah->led_pin, 0); ieee80211_wake_queues(hw); +out: spin_unlock_bh(&sc->sc_pcu_lock); ath9k_ps_restore(sc);