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>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 6daaad1..7751a75 100644 (file)
--- 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);
        }