[PATCH 3.10 01/24] ath9k: declare required extra tx headroom

Greg Kroah-Hartman
2015-11-06T19:51:37Z

From: Felix Fietkau <nbd@openwrt.org>

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@openwrt.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/ath/ath9k/init.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -819,6 +819,7 @@ void ath9k_set_hw_capab(struct ath_softc
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;