iwlagn: update write pointers for all tx queues after wakeup

Wakeup interrupt has been updating write pointers (indexes, actually) only
for tx queues 0-5.  This is adequate just for 3945, but inadequate for other
devices, all of which have more tx queues.  Now updating all tx/command queues,
so device can be aware of all new tx and host commands enqueued while
device was asleep.

This can potentially improve data traffic bandwidth and/or latency.

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 9 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 7751a75d4dc9..0cb95bfd15a5 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -890,6 +890,7 @@ static void iwl_irq_tasklet_legacy(struct iwl_priv *priv)
         u32 inta, handled = 0;
         u32 inta_fh;
         unsigned long flags;
+        u32 i;
 #ifdef CONFIG_IWLWIFI_DEBUG
         u32 inta_mask;
 #endif
@@ -1007,19 +1008,17 @@ static void iwl_irq_tasklet_legacy(struct iwl_priv *priv)
                 handled |= CSR_INT_BIT_SW_ERR;
         }
 
-        /* uCode wakes up after power-down sleep */
+        /*
+         * uCode wakes up after power-down sleep.
+         * Tell device about any new tx or host commands enqueued,
+         * and about any Rx buffers made available while asleep.
+         */
         if (inta & CSR_INT_BIT_WAKEUP) {
                 IWL_DEBUG_ISR(priv, "Wakeup interrupt\n");
                 iwl_rx_queue_update_write_ptr(priv, &priv->rxq);
-                iwl_txq_update_write_ptr(priv, &priv->txq[0]);
-                iwl_txq_update_write_ptr(priv, &priv->txq[1]);
-                iwl_txq_update_write_ptr(priv, &priv->txq[2]);
-                iwl_txq_update_write_ptr(priv, &priv->txq[3]);
-                iwl_txq_update_write_ptr(priv, &priv->txq[4]);
-                iwl_txq_update_write_ptr(priv, &priv->txq[5]);
-
+                for (i = 0; i < priv->hw_params.max_txq_num; i++)
+                        iwl_txq_update_write_ptr(priv, &priv->txq[i]);
                 priv->isr_stats.wakeup++;
-
                 handled |= CSR_INT_BIT_WAKEUP;
         }