iwlagn: fix a race in the unmapping of the TFDs

While inspecting the code, I saw that iwl_tx_queue_unmap modifies
the read pointer of the Tx queue without taking any locks. This means
that it can race with the reclaim flow. This can possibly lead to
a DMA warning complaining that we unmap the same buffer twice.

This is more a W/A than a fix since it is really weird to take
sta_lock inside iwl_tx_queue_unmap, but it can help until we revamp
the locking model in the transport layer.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
index 60067c7..f69aecb 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -406,6 +406,7 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id)
        struct iwl_tx_queue *txq = &trans_pcie->txq[txq_id];
        struct iwl_queue *q = &txq->q;
        enum dma_data_direction dma_dir;
+       unsigned long flags;
 
        if (!q->n_bd)
                return;
@@ -418,12 +419,14 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id)
        else
                dma_dir = DMA_TO_DEVICE;
 
+       spin_lock_irqsave(&trans->shrd->sta_lock, flags);
        while (q->write_ptr != q->read_ptr) {
                /* The read_ptr needs to bound by q->n_window */
                iwlagn_txq_free_tfd(trans, txq, get_cmd_index(q, q->read_ptr),
                                    dma_dir);
                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
        }
+       spin_unlock_irqrestore(&trans->shrd->sta_lock, flags);
 }
 
 /**