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mac80211: add tx dequeue function for process context

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Since ieee80211_tx_dequeue() must not be called with softirqs enabled
(i.e. from process context without proper disable of bottom halves),
we add a wrapper that disables bottom halves before calling
ieee80211_tx_dequeue()

The new function is named ieee80211_tx_dequeue_ni() just as all other
from-process-context versions found in mac80211.

The documentation of ieee80211_tx_dequeue() is also updated so it
mentions that the function should not be called from process context.

Signed-off-by: Erik Stromdahl <erik.stromdahl@gmail.com>
Link: https://lore.kernel.org/r/20190617200140.6189-1-erik.stromdahl@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Erik Stromdahl
2019-06-17 22:01:39 +02:00
committed by Johannes Berg
parent a11e2f8548
commit fb0e76abe3
2 changed files with 28 additions and 0 deletions
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2
net/mac80211/tx.c
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@@ -3546,6 +3546,8 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
ieee80211_tx_result r;
struct ieee80211_vif *vif = txq->vif;
WARN_ON_ONCE(softirq_count() == 0);
begin:
spin_lock_bh(&fq->lock);