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iwlwifi: mvm: avoid possible deadlock in TX path

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iwl_mvm_tx_mpdu() may run from iwl_mvm_add_new_dqa_stream_wk(), where
soft-IRQs aren't disabled. In this case, it may hold the station lock
and be interrupted by a soft-IRQ that also wants to acquire said lock,
leading to a deadlock.

Fix it by disabling soft-IRQs in iwl_mvm_add_new_dqa_stream_wk().

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Johannes Berg 2019-03-05 13:32:30 +01:00 committed by Luca Coelho
parent 4837696f6b
commit f5ae2f932e
1 changed files with 2 additions and 0 deletions
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drivers/net/wireless/intel/iwlwifi/mvm/sta.c
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@ -1399,7 +1399,9 @@ void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
iwl_mvm_sta_alloc_queue(mvm, txq->sta, txq->ac, tid);
list_del_init(&mvmtxq->list);
local_bh_disable();
iwl_mvm_mac_itxq_xmit(mvm->hw, txq);
local_bh_enable();
}
mutex_unlock(&mvm->mutex);