linux-kernel - [PATCH 3.2 22/94] iwlwifi: dvm: don't enable CTS to self

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Message-ID: <lsq.1407170911.38496038@decadent.org.uk>
Date:	Mon, 04 Aug 2014 17:48:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Emmanuel Grumbach" <emmanuel.grumbach@...el.com>
Subject: [PATCH 3.2 22/94] iwlwifi: dvm: don't enable CTS to self

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

commit 43d826ca5979927131685cc2092c7ce862cb91cd upstream.

We should always prefer to use full RTS protection. Using
CTS to self gives a meaningless improvement, but this flow
is much harder for the firmware which is likely to have
issues with it.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
[bwh: Backported to 3.2:
 - Adjust filename
 - Condition for RXON_FLG_SELF_CTS_EN in iwlagn_commit_rxon() was different]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/iwlwifi/iwl-agn-rxon.c | 12 ------------
 1 file changed, 12 deletions(-)

--- a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
@@ -440,14 +440,6 @@ int iwlagn_commit_rxon(struct iwl_priv *
 	/* always get timestamp with Rx frame */
 	ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;
 
-	/*
-	 * force CTS-to-self frames protection if RTS-CTS is not preferred
-	 * one aggregation protection method
-	 */
-	if (!(priv->cfg->ht_params &&
-	      priv->cfg->ht_params->use_rts_for_aggregation))
-		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
-
 	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
 	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
 		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
@@ -880,11 +872,6 @@ void iwlagn_bss_info_changed(struct ieee
 	else
 		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 
-	if (bss_conf->use_cts_prot)
-		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
-	else
-		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
-
 	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 
 	if (vif->type == NL80211_IFTYPE_AP ||

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