iwlwifi: recalculate average tpt if not current

We currently have this check as a BUG_ON, which is being hit by people.
Previously it was an error with a recalculation if not current, return that
code.

The BUG_ON was introduced by:
commit 3110bef78cb4282c58245bc8fd6d95d9ccb19749
Author: Guy Cohen <guy.cohen@intel.com>
Date:   Tue Sep 9 10:54:54 2008 +0800

    iwlwifi: Added support for 3 antennas

... the portion adding the BUG_ON is reverted since we are encountering the error
and BUG_ON was created with assumption that error is not encountered.

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-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index f01f242659c3..331c23a6c4e8 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -2077,10 +2077,12 @@ static void rs_rate_scale_perform(struct iwl_priv *priv,
         }
         /* Else we have enough samples; calculate estimate of
          * actual average throughput */
-
-        /* Sanity-check TPT calculations */
-        BUG_ON(window->average_tpt != ((window->success_ratio *
-                        tbl->expected_tpt[index] + 64) / 128));
+        if (window->average_tpt != ((window->success_ratio *
+                        tbl->expected_tpt[index] + 64) / 128)) {
+                IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
+                window->average_tpt = ((window->success_ratio *
+                                        tbl->expected_tpt[index] + 64) / 128);
+        }
 
         /* If we are searching for better modulation mode, check success. */
         if (lq_sta->search_better_tbl &&