linux-kernel - [PATCH 3.12 051/118] ath9k: fix duration calculation for non-aggregated packets

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Date:	Wed, 18 Dec 2013 13:11:28 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Simon Wunderlich <sw@...onwunderlich.de>,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [PATCH 3.12 051/118] ath9k: fix duration calculation for non-aggregated packets

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

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

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

commit bbf807bc0697e577c137a5fffb30fca7c6a45da1 upstream.

When not aggregating packets, fi->framelen should be passed in as length
to calculate the duration. Before the tx path rework, ath_tx_fill_desc
was called for either one aggregate, or one single frame, with the
length of the packet or the aggregate as a parameter.
After the rework, ath_tx_sched_aggr can pass a burst of single frames to
ath_tx_fill_desc and sets len=0.
Fix broken duration calculation by overriding the length in ath_tx_fill_desc
before passing it to ath_buf_set_rate.

Reported-by: Simon Wunderlich <sw@...onwunderlich.de>
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/ath/ath9k/xmit.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1275,6 +1275,10 @@ static void ath_tx_fill_desc(struct ath_
 				if (!rts_thresh || (len > rts_thresh))
 					rts = true;
 			}
+
+			if (!aggr)
+				len = fi->framelen;
+
 			ath_buf_set_rate(sc, bf, &info, len, rts);
 		}

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