iwlwifi: pcie: use don't disable interrupt when rxq->lock is taken

This lock was never acquired in the primary interrupt
handler, but since it was acquired along with irq_lock
which had to disable interrupts, rxq->lock had to disable
interrupts too.
Now that trans_pcie->irq_lock isn't acquired in the primary
interrupt handler, rxq->lock can let interrupt enabled.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/pcie/rx.c b/drivers/net/wireless/iwlwifi/pcie/rx.c
index 7ab510e..e06a3fe 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/rx.c
+++ b/drivers/net/wireless/iwlwifi/pcie/rx.c
@@ -148,10 +148,9 @@ int iwl_pcie_rx_stop(struct iwl_trans *trans)
 static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans,
                                    struct iwl_rxq *rxq)
 {
-       unsigned long flags;
        u32 reg;
 
-       spin_lock_irqsave(&rxq->lock, flags);
+       spin_lock(&rxq->lock);
 
        if (rxq->need_update == 0)
                goto exit_unlock;
@@ -190,7 +189,7 @@ static void iwl_pcie_rxq_inc_wr_ptr(struct iwl_trans *trans,
        rxq->need_update = 0;
 
  exit_unlock:
-       spin_unlock_irqrestore(&rxq->lock, flags);
+       spin_unlock(&rxq->lock);
 }
 
 /*
@@ -209,7 +208,6 @@ static void iwl_pcie_rxq_restock(struct iwl_trans *trans)
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_rx_mem_buffer *rxb;
-       unsigned long flags;
 
        /*
         * If the device isn't enabled - not need to try to add buffers...
@@ -222,7 +220,7 @@ static void iwl_pcie_rxq_restock(struct iwl_trans *trans)
        if (!test_bit(STATUS_DEVICE_ENABLED, &trans->status))
                return;
 
-       spin_lock_irqsave(&rxq->lock, flags);
+       spin_lock(&rxq->lock);
        while ((iwl_rxq_space(rxq) > 0) && (rxq->free_count)) {
                /* The overwritten rxb must be a used one */
                rxb = rxq->queue[rxq->write];
@@ -239,7 +237,7 @@ static void iwl_pcie_rxq_restock(struct iwl_trans *trans)
                rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
                rxq->free_count--;
        }
-       spin_unlock_irqrestore(&rxq->lock, flags);
+       spin_unlock(&rxq->lock);
        /* If the pre-allocated buffer pool is dropping low, schedule to
         * refill it */
        if (rxq->free_count <= RX_LOW_WATERMARK)
@@ -248,9 +246,9 @@ static void iwl_pcie_rxq_restock(struct iwl_trans *trans)
        /* If we've added more space for the firmware to place data, tell it.
         * Increment device's write pointer in multiples of 8. */
        if (rxq->write_actual != (rxq->write & ~0x7)) {
-               spin_lock_irqsave(&rxq->lock, flags);
+               spin_lock(&rxq->lock);
                rxq->need_update = 1;
-               spin_unlock_irqrestore(&rxq->lock, flags);
+               spin_unlock(&rxq->lock);
                iwl_pcie_rxq_inc_wr_ptr(trans, rxq);
        }
 }
@@ -270,16 +268,15 @@ static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority)
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_rx_mem_buffer *rxb;
        struct page *page;
-       unsigned long flags;
        gfp_t gfp_mask = priority;
 
        while (1) {
-               spin_lock_irqsave(&rxq->lock, flags);
+               spin_lock(&rxq->lock);
                if (list_empty(&rxq->rx_used)) {
-                       spin_unlock_irqrestore(&rxq->lock, flags);
+                       spin_unlock(&rxq->lock);
                        return;
                }
-               spin_unlock_irqrestore(&rxq->lock, flags);
+               spin_unlock(&rxq->lock);
 
                if (rxq->free_count > RX_LOW_WATERMARK)
                        gfp_mask |= __GFP_NOWARN;
@@ -308,17 +305,17 @@ static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority)
                        return;
                }
 
-               spin_lock_irqsave(&rxq->lock, flags);
+               spin_lock(&rxq->lock);
 
                if (list_empty(&rxq->rx_used)) {
-                       spin_unlock_irqrestore(&rxq->lock, flags);
+                       spin_unlock(&rxq->lock);
                        __free_pages(page, trans_pcie->rx_page_order);
                        return;
                }
                rxb = list_first_entry(&rxq->rx_used, struct iwl_rx_mem_buffer,
                                       list);
                list_del(&rxb->list);
-               spin_unlock_irqrestore(&rxq->lock, flags);
+               spin_unlock(&rxq->lock);
 
                BUG_ON(rxb->page);
                rxb->page = page;
@@ -329,9 +326,9 @@ static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority)
                                     DMA_FROM_DEVICE);
                if (dma_mapping_error(trans->dev, rxb->page_dma)) {
                        rxb->page = NULL;
-                       spin_lock_irqsave(&rxq->lock, flags);
+                       spin_lock(&rxq->lock);
                        list_add(&rxb->list, &rxq->rx_used);
-                       spin_unlock_irqrestore(&rxq->lock, flags);
+                       spin_unlock(&rxq->lock);
                        __free_pages(page, trans_pcie->rx_page_order);
                        return;
                }
@@ -340,12 +337,12 @@ static void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority)
                /* and also 256 byte aligned! */
                BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
 
-               spin_lock_irqsave(&rxq->lock, flags);
+               spin_lock(&rxq->lock);
 
                list_add_tail(&rxb->list, &rxq->rx_free);
                rxq->free_count++;
 
-               spin_unlock_irqrestore(&rxq->lock, flags);
+               spin_unlock(&rxq->lock);
        }
 }
 
@@ -510,7 +507,6 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        int i, err;
-       unsigned long flags;
 
        if (!rxq->bd) {
                err = iwl_pcie_rx_alloc(trans);
@@ -518,7 +514,7 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
                        return err;
        }
 
-       spin_lock_irqsave(&rxq->lock, flags);
+       spin_lock(&rxq->lock);
 
        INIT_WORK(&trans_pcie->rx_replenish, iwl_pcie_rx_replenish_work);
 
@@ -534,7 +530,7 @@ int iwl_pcie_rx_init(struct iwl_trans *trans)
        rxq->read = rxq->write = 0;
        rxq->write_actual = 0;
        memset(rxq->rb_stts, 0, sizeof(*rxq->rb_stts));
-       spin_unlock_irqrestore(&rxq->lock, flags);
+       spin_unlock(&rxq->lock);
 
        iwl_pcie_rx_replenish(trans);
 
@@ -552,7 +548,6 @@ void iwl_pcie_rx_free(struct iwl_trans *trans)
 {
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
-       unsigned long flags;
 
        /*if rxq->bd is NULL, it means that nothing has been allocated,
         * exit now */
@@ -563,9 +558,9 @@ void iwl_pcie_rx_free(struct iwl_trans *trans)
 
        cancel_work_sync(&trans_pcie->rx_replenish);
 
-       spin_lock_irqsave(&rxq->lock, flags);
+       spin_lock(&rxq->lock);
        iwl_pcie_rxq_free_rbs(trans);
-       spin_unlock_irqrestore(&rxq->lock, flags);
+       spin_unlock(&rxq->lock);
 
        dma_free_coherent(trans->dev, sizeof(__le32) * RX_QUEUE_SIZE,
                          rxq->bd, rxq->bd_dma);
@@ -588,7 +583,6 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
        struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
        struct iwl_rxq *rxq = &trans_pcie->rxq;
        struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
-       unsigned long flags;
        bool page_stolen = false;
        int max_len = PAGE_SIZE << trans_pcie->rx_page_order;
        u32 offset = 0;
@@ -690,7 +684,7 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
        /* Reuse the page if possible. For notification packets and
         * SKBs that fail to Rx correctly, add them back into the
         * rx_free list for reuse later. */
-       spin_lock_irqsave(&rxq->lock, flags);
+       spin_lock(&rxq->lock);
        if (rxb->page != NULL) {
                rxb->page_dma =
                        dma_map_page(trans->dev, rxb->page, 0,
@@ -711,7 +705,7 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
                }
        } else
                list_add_tail(&rxb->list, &rxq->rx_used);
-       spin_unlock_irqrestore(&rxq->lock, flags);
+       spin_unlock(&rxq->lock);
 }
 
 /*