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iwlwifi: pcie: mark command queue lock with separate lockdep class

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Emmanuel reports that when CMD_WANT_ASYNC_CALLBACK is used by mvm,
the callback will be called with the command queue lock held, and
mvm will try to stop all (other) TX queues, which acquires their
locks - this caused a false lockdep recursive locking report.

Suppress this report by marking the command queue lock with a new,
separate, lock class so lockdep can tell the difference between
the two types of queues.

Fixes: 156f92f2b471 ("iwlwifi: block the queues when we send ADD_STA for uAPSD")
Reported-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
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 2016-09-22 10:31:41 +02:00 committed by Luca Coelho
parent 1ea2643961
commit faead41cc7
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/intel/iwlwifi/pcie/tx.c
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@ -592,6 +592,7 @@ error:
static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
int slots_num, u32 txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int ret;
txq->need_update = false;
@ -606,6 +607,13 @@ static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
return ret;
spin_lock_init(&txq->lock);
if (txq_id == trans_pcie->cmd_queue) {
static struct lock_class_key iwl_pcie_cmd_queue_lock_class;
lockdep_set_class(&txq->lock, &iwl_pcie_cmd_queue_lock_class);
}
__skb_queue_head_init(&txq->overflow_q);
/*