This is a note to let you know that I've just added the patch titled
iwlwifi: disable greenfield transmissions as a workaround
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iwlwifi-disable-greenfield-transmissions-as-a-workaround.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 50e2a30cf6fcaeb2d27360ba614dd169a10041c5 Mon Sep 17 00:00:00 2001
From: Johannes Berg <[email protected]>
Date: Sun, 5 Aug 2012 18:31:46 +0200
Subject: iwlwifi: disable greenfield transmissions as a workaround
From: Johannes Berg <[email protected]>
commit 50e2a30cf6fcaeb2d27360ba614dd169a10041c5 upstream.
There's a bug that causes the rate scaling to get stuck
when it has to use single-stream rates with a peer that
can do GF and SGI; the two are incompatible so we can't
use them together, but that causes the algorithm to not
work at all, it always rejects updates.
Disable greenfield for now to prevent that problem.
Reviewed-by: Emmanuel Grumbach <[email protected]>
Tested-by: Cesar Eduardo Barros <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/iwlwifi/iwl-agn-rs.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -709,11 +709,14 @@ static int rs_toggle_antenna(u32 valid_a
*/
static bool rs_use_green(struct ieee80211_sta *sta)
{
- struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
- struct iwl_rxon_context *ctx = sta_priv->ctx;
-
- return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
- !(ctx->ht.non_gf_sta_present);
+ /*
+ * There's a bug somewhere in this code that causes the
+ * scaling to get stuck because GF+SGI can't be combined
+ * in SISO rates. Until we find that bug, disable GF, it
+ * has only limited benefit and we still interoperate with
+ * GF APs since we can always receive GF transmissions.
+ */
+ return false;
}
/**
Patches currently in stable-queue which might be from [email protected]
are
queue-3.4/iwlwifi-disable-greenfield-transmissions-as-a-workaround.patch
queue-3.4/mac80211-cancel-mesh-path-timer.patch
queue-3.4/wireless-reg-restore-previous-behaviour-of-chan-max_power-calculations.patch
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