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iwlwifi: remove lock around txq_enable 

This locking isn't needed. The only locking we need is when
we access prph registers but there is already a separate
lock for that.
Since we haven't returned from the mac80211's
IEEE80211_AMPDU_TX_OPERATIONAL ampdu_action, we cannot
receive any Tx frame for that sta / tid while enabling the
queue.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Emmanuel Grumbach 2012-06-07 13:44:14 +03:00 committed by Johannes Berg
parent 1ce8658c08
commit 5bf9a89d9a
3 changed files with 5 additions and 26 deletions
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5
drivers/net/wireless/iwlwifi/pcie/internal.h
View File

@ -339,12 +339,9 @@ void iwl_tx_cmd_complete(struct iwl_trans *trans,
void iwl_trans_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
struct iwl_tx_queue *txq,
u16 byte_cnt);
void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int queue);
void __iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id,
int fifo, int sta_id, int tid,
int frame_limit, u16 ssn);
void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo,
int sta_id, int tid, int frame_limit, u16 ssn);
void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int queue);
void iwl_txq_free_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq,
enum dma_data_direction dma_dir);
int iwl_tx_queue_reclaim(struct iwl_trans *trans, int txq_id, int index,

5
drivers/net/wireless/iwlwifi/pcie/trans.c
View File

@ -1068,9 +1068,8 @@ static void iwl_tx_start(struct iwl_trans *trans)
for (i = 0; i < trans_pcie->n_q_to_fifo; i++) {
int fifo = trans_pcie->setup_q_to_fifo[i];
__iwl_trans_pcie_txq_enable(trans, i, fifo, IWL_INVALID_STATION,
IWL_TID_NON_QOS,
SCD_FRAME_LIMIT, 0);
iwl_trans_pcie_txq_enable(trans, i, fifo, IWL_INVALID_STATION,
IWL_TID_NON_QOS, SCD_FRAME_LIMIT, 0);
}
/* Activate all Tx DMA/FIFO channels */

21
drivers/net/wireless/iwlwifi/pcie/tx.c
View File

@ -415,14 +415,11 @@ static inline void iwl_txq_set_inactive(struct iwl_trans *trans, u16 txq_id)
(1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
}
void __iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id,
int fifo, int sta_id, int tid,
int frame_limit, u16 ssn)
void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo,
int sta_id, int tid, int frame_limit, u16 ssn)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
lockdep_assert_held(&trans_pcie->irq_lock);
if (test_and_set_bit(txq_id, trans_pcie->queue_used))
WARN_ONCE(1, "queue %d already used - expect issues", txq_id);
@ -480,20 +477,6 @@ void __iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id,
txq_id, fifo, ssn & 0xff);
}
void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo,
int sta_id, int tid, int frame_limit, u16 ssn)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
unsigned long flags;
spin_lock_irqsave(&trans_pcie->irq_lock, flags);
__iwl_trans_pcie_txq_enable(trans, txq_id, fifo, sta_id,
tid, frame_limit, ssn);
spin_unlock_irqrestore(&trans_pcie->irq_lock, flags);
}
void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);