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iwlwifi: pcie: fix unused txq NULL pointer dereference

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Before TVQM, all TX queues were allocated straight at init.
With TVQM, queues are allocated on demand and hence we need
to check if a queue exists before dereferencing it.

Fixes: 66128fa08806 ("iwlwifi: move to TVQM mode")
Signed-off-by: Mordechai Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Mordechai Goodstein 2017-06-11 18:00:36 +03:00 committed by Luca Coelho
parent 0b0f934e92
commit f6eac740a9
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/intel/iwlwifi/pcie/tx.c
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@ -298,6 +298,9 @@ void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans)
for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
struct iwl_txq *txq = trans_pcie->txq[i];
if (!test_bit(i, trans_pcie->queue_used))
continue;
spin_lock_bh(&txq->lock);
if (txq->need_update) {
iwl_pcie_txq_inc_wr_ptr(trans, txq);