iwl4965: add comments to rate scaling code

Add comments to rate scaling code.

Signed-off-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index 11ef1c0c5d0d..33eace757435 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -1488,6 +1488,7 @@ int iwl4965_rate_index_from_plcp(int plcp)
 {
         int i = 0;
 
+        /* 4965 HT rate format */
         if (plcp & RATE_MCS_HT_MSK) {
                 i = (plcp & 0xff);
 
@@ -1501,6 +1502,8 @@ int iwl4965_rate_index_from_plcp(int plcp)
                 if ((i >= IWL_FIRST_OFDM_RATE) &&
                     (i <= IWL_LAST_OFDM_RATE))
                         return i;
+
+        /* 4965 legacy rate format, search for match in table */
         } else {
                 for (i = 0; i < ARRAY_SIZE(iwl4965_rates); i++)
                         if (iwl4965_rates[i].plcp == (plcp &0xFF))