From: Bob Copeland Date: Tue, 13 Jul 2010 15:32:41 +0000 (-0400) Subject: ath5k: disable tasklets during reset X-Git-Tag: v2.6.36-rc1~571^2~107^2~32 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=450464def78c94018d997ae6f823578499cdf879;p=platform%2Fkernel%2Flinux-exynos.git ath5k: disable tasklets during reset Based on a patch from Bruno Randolf, attempting useful work while we are resetting the chip just leads to interface lockups and bad descriptor data, and possibly DMAing to freed buffers. Let's suspend all tasklets while reprogramming the registers in the card to avoid such problems. In the future we can convert the tasklets to threaded interrupt handlers to simplify things. Signed-off-by: Bob Copeland Acked-by: Bruno Randolf Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index b290cc6..b0e1ca9 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -2639,6 +2639,15 @@ ath5k_stop_locked(struct ath5k_softc *sc) return 0; } +static void stop_tasklets(struct ath5k_softc *sc) +{ + tasklet_kill(&sc->rxtq); + tasklet_kill(&sc->txtq); + tasklet_kill(&sc->calib); + tasklet_kill(&sc->beacontq); + tasklet_kill(&sc->ani_tasklet); +} + /* * Stop the device, grabbing the top-level lock to protect * against concurrent entry through ath5k_init (which can happen @@ -2683,11 +2692,7 @@ ath5k_stop_hw(struct ath5k_softc *sc) mmiowb(); mutex_unlock(&sc->lock); - tasklet_kill(&sc->rxtq); - tasklet_kill(&sc->txtq); - tasklet_kill(&sc->calib); - tasklet_kill(&sc->beacontq); - tasklet_kill(&sc->ani_tasklet); + stop_tasklets(sc); ath5k_rfkill_hw_stop(sc->ah); @@ -2937,8 +2942,11 @@ ath5k_reset(struct ath5k_softc *sc, struct ieee80211_channel *chan) ATH5K_DBG(sc, ATH5K_DEBUG_RESET, "resetting\n"); + ath5k_hw_set_imr(ah, 0); + synchronize_irq(sc->pdev->irq); + stop_tasklets(sc); + if (chan) { - ath5k_hw_set_imr(ah, 0); ath5k_txq_cleanup(sc); ath5k_rx_stop(sc);