linux-kernel - [PATCH 3.4 62/92] ath9k: declare required extra tx headroom

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Date:	Mon, 18 Apr 2016 18:46:07 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felix Fietkau <nbd@...nwrt.org>,
	Kalle Valo <kvalo@...eaurora.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 62/92] ath9k: declare required extra tx headroom

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

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

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


commit 029cd0370241641eb70235d205aa0b90c84dce44 upstream.

ath9k inserts padding between the 802.11 header and the data area (to
align it). Since it didn't declare this extra required headroom, this
led to some nasty issues like randomly dropped packets in some setups.

Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/net/wireless/ath/ath9k/init.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index cac5b25..37534a0 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -683,6 +683,7 @@ void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
 	hw->max_rate_tries = 10;
 	hw->sta_data_size = sizeof(struct ath_node);
 	hw->vif_data_size = sizeof(struct ath_vif);
+	hw->extra_tx_headroom = 4;
 
 	hw->wiphy->available_antennas_rx = BIT(ah->caps.max_rxchains) - 1;
 	hw->wiphy->available_antennas_tx = BIT(ah->caps.max_txchains) - 1;
-- 
1.9.1