[patch 116/149] iwlwifi: recalculate average tpt if not current

Greg KH
2010-07-01T18:32:43Z

2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

From: Reinette Chatre <reinette.chatre@intel.com>

commit 3d79b2a9eeaa066b35c49fbb17e3156a3c482c3e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/iwlwifi/iwl-agn-rs.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -2193,9 +2193,12 @@ static void rs_rate_scale_perform(struct

/* Else we have enough samples; calculate estimate of
* actual average throughput */
-
- 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 &&