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ath9k: fix an RCU issue in calling ieee80211_get_tx_rates

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ath_txq_schedule is called outside of the drv_tx call, so it needs RCU
protection.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2013-06-22 12:39:26 +02:00 committed by John W. Linville
parent 2f2a8846d5
commit 23bc2021c5
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/ath/ath9k/xmit.c
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@ -1570,6 +1570,8 @@ void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
return; return;
rcu_read_lock();
ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list); ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
last_ac = list_entry(txq->axq_acq.prev, struct ath_atx_ac, list); last_ac = list_entry(txq->axq_acq.prev, struct ath_atx_ac, list);
@ -1608,8 +1610,10 @@ void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
if (ac == last_ac || if (ac == last_ac ||
txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
return; break;
} }
rcu_read_unlock();
} }
/***********/ /***********/