iwlagn: Clarify FH_TX interrupt

Add/clarify comments and debug messages for interrupt used only for uCode load

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, 6 insertions, 4 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 6daaad1e4bc9..7751a75d4dc9 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -1033,11 +1033,12 @@ static void iwl_irq_tasklet_legacy(struct iwl_priv *priv)
                 handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX);
         }
 
+        /* This "Tx" DMA channel is used only for loading uCode */
         if (inta & CSR_INT_BIT_FH_TX) {
-                IWL_DEBUG_ISR(priv, "Tx interrupt\n");
+                IWL_DEBUG_ISR(priv, "uCode load interrupt\n");
                 priv->isr_stats.tx++;
                 handled |= CSR_INT_BIT_FH_TX;
-                /* FH finished to write, send event */
+                /* Wake up uCode load routine, now that load is complete */
                 priv->ucode_write_complete = 1;
                 wake_up_interruptible(&priv->wait_command_queue);
         }
@@ -1234,12 +1235,13 @@ static void iwl_irq_tasklet(struct iwl_priv *priv)
                 iwl_leds_background(priv);
         }
 
+        /* This "Tx" DMA channel is used only for loading uCode */
         if (inta & CSR_INT_BIT_FH_TX) {
                 iwl_write32(priv, CSR_FH_INT_STATUS, CSR49_FH_INT_TX_MASK);
-                IWL_DEBUG_ISR(priv, "Tx interrupt\n");
+                IWL_DEBUG_ISR(priv, "uCode load interrupt\n");
                 priv->isr_stats.tx++;
                 handled |= CSR_INT_BIT_FH_TX;
-                /* FH finished to write, send event */
+                /* Wake up uCode load routine, now that load is complete */
                 priv->ucode_write_complete = 1;
                 wake_up_interruptible(&priv->wait_command_queue);
         }