Re: [PATCH] mac80211: Use RCU protection in ieee80211_get_tx_rates()

From: Felix Fietkau
Date: Wed Jun 12 2013 - 05:48:16 EST

On 2013-06-12 10:00 AM, Calvin Owens wrote:
> Copying the rate table should be done in an RCU read-side critical
> section.
I think this approach is wrong. The sta entry is also under RCU
protection (no locking for read access in that part of the code.
In a normal driver tx path, no extra rcu_read_lock/rcu_read_unlock is
needed. Only if the driver does some scheduling outside of the tx
function (which ath9k does), this RCU warning appears.

How about this change instead:
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1570,6 +1570,8 @@ void ath_txq_schedule(struct ath_softc *
txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)

+ rcu_read_lock();
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);

@@ -1608,8 +1610,10 @@ void ath_txq_schedule(struct ath_softc *

if (ac == last_ac ||
txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
- return;
+ break;
+ rcu_read_unlock();


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