ath9k: Add comments for making pm-qos as modparam

PM-QOS value can be user specified via module parameter.
This patch adds few comments regarding this in the driver
code.

Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 36f4f5afe738..4d647169439c 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1196,6 +1196,10 @@ static int ath9k_start(struct ieee80211_hw *hw)
                         ath9k_btcoex_timer_resume(sc);
         }
 
+        /* User has the option to provide pm-qos value as a module
+         * parameter rather than using the default value of
+         * 'ATH9K_PM_QOS_DEFAULT_VALUE'.
+         */
         pm_qos_update_request(&sc->pm_qos_req, ath9k_pm_qos_value);
 
         if (ah->caps.pcie_lcr_extsync_en && common->bus_ops->extn_synch_en)