| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 39/93] ath9k: disable the tasklet before taking the PCU lock | Date | Tue, 5 Feb 2013 20:06:28 -0200 |
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3.5.7.5 -stable review patch. If anyone has any objections, please let me know.
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From: Felix Fietkau <nbd@openwrt.org>
commit 4668cce527acb3bd048c5e6c99b157a14b214671 upstream.
Fixes a reported CPU soft lockup where the tasklet tries to acquire the lock and blocks while ath_prepare_reset (holding the lock) waits for it to complete.
Reported-by: Robert Shade <robert.shade@gmail.com> Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com> [ herton: adjust context ] Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/net/wireless/ath/ath9k/main.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index e5c9575..68dd853 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -250,16 +250,12 @@ static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx) ath9k_debug_samp_bb_mac(sc); ath9k_hw_disable_interrupts(ah); - tasklet_disable(&sc->intr_tq); - if (!ath_stoprecv(sc)) ret = false; if (!ath_drain_all_txq(sc, retry_tx)) ret = false; - tasklet_enable(&sc->intr_tq); - return ret; } @@ -321,6 +317,7 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan, __ath_cancel_work(sc); + tasklet_disable(&sc->intr_tq); spin_lock_bh(&sc->sc_pcu_lock); if (!(sc->sc_flags & SC_OP_OFFCHANNEL)) { @@ -351,6 +348,8 @@ static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan, out: spin_unlock_bh(&sc->sc_pcu_lock); + tasklet_enable(&sc->intr_tq); + return r; } -- 1.7.9.5
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