From cda4ee3f2e6907e89baf7a12e02e02fa208c0625 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Fri, 14 Oct 2011 12:54:47 -0700 Subject: [PATCH] iwlagn: fix the race in the unmapping of the HCMD As Stanislaw pointed out, my patch iwlagn: fix a race in the unmapping of the TFDs solved only part of the problem. The race still exists for TFDs of the host commands. Fix that too. Reported-by: Stanislaw Gruszka Signed-off-by: Emmanuel Grumbach Signed-off-by: Wey-Yi Guy Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-trans-pcie.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c index 8e8c75c997ee..da3411057afc 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c @@ -407,6 +407,7 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id) struct iwl_queue *q = &txq->q; enum dma_data_direction dma_dir; unsigned long flags; + spinlock_t *lock; if (!q->n_bd) return; @@ -414,19 +415,22 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id) /* In the command queue, all the TBs are mapped as BIDI * so unmap them as such. */ - if (txq_id == trans->shrd->cmd_queue) + if (txq_id == trans->shrd->cmd_queue) { dma_dir = DMA_BIDIRECTIONAL; - else + lock = &trans->hcmd_lock; + } else { dma_dir = DMA_TO_DEVICE; + lock = &trans->shrd->sta_lock; + } - spin_lock_irqsave(&trans->shrd->sta_lock, flags); + spin_lock_irqsave(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); + spin_unlock_irqrestore(lock, flags); } /** -- 2.20.1