linux-kernel - [ 039/102] mac80211/minstrel

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Message-Id: <20130809015019.033002672@linuxfoundation.org>
Date:	Thu,  8 Aug 2013 18:57:15 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Felix Fietkau <nbd@...nwrt.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: [ 039/102] mac80211/minstrel_ht: fix cck rate sampling

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Felix Fietkau <nbd@...nwrt.org>

commit 1cd158573951f737fbc878a35cb5eb47bf9af3d5 upstream.

The CCK group needs special treatment to set the right flags and rate
index. Add this missing check to prevent setting broken rates for tx
packets.

Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Johannes Berg <johannes@...solutions.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/rc80211_minstrel_ht.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -804,10 +804,18 @@ minstrel_ht_get_rate(void *priv, struct
 
 	sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES];
 	info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
+	rate->count = 1;
+
+	if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
+		int idx = sample_idx % ARRAY_SIZE(mp->cck_rates);
+		rate->idx = mp->cck_rates[idx];
+		rate->flags = 0;
+		return;
+	}
+
 	rate->idx = sample_idx % MCS_GROUP_RATES +
 		    (sample_group->streams - 1) * MCS_GROUP_RATES;
 	rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags;
-	rate->count = 1;
 }
 
 static void


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