ath9k: fix handling of tx headroom for padding (fixes #20556)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 47042

package/kernel/mac80211/patches/336-ath9k-declare-required-extra-tx-headroom.patch

+From: Felix Fietkau <nbd@openwrt.org>
+Date: Thu, 24 Sep 2015 16:57:37 +0200
+Subject: [PATCH] ath9k: declare required extra tx headroom
+
+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.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/init.c
++++ b/drivers/net/wireless/ath/ath9k/init.c
+@@ -875,6 +875,7 @@ static void ath9k_set_hw_capab(struct at
+ 	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;

package/kernel/mac80211/patches/501-ath9k_ahb_init.patch

 --- a/drivers/net/wireless/ath/ath9k/init.c
 +++ b/drivers/net/wireless/ath/ath9k/init.c
-@@ -1031,23 +1031,23 @@ static int __init ath9k_init(void)
+@@ -1032,23 +1032,23 @@ static int __init ath9k_init(void)
  {
  	int error;
  

package/kernel/mac80211/patches/530-ath9k_extra_leds.patch

@@ -165,7 +165,7 @@
  void ath_fill_led_pin(struct ath_softc *sc)
 --- a/drivers/net/wireless/ath/ath9k/init.c
 +++ b/drivers/net/wireless/ath/ath9k/init.c
-@@ -943,7 +943,7 @@ int ath9k_init_device(u16 devid, struct
+@@ -944,7 +944,7 @@ int ath9k_init_device(u16 devid, struct
  
  #ifdef CPTCFG_MAC80211_LEDS
  	/* must be initialized before ieee80211_register_hw */

package/kernel/mac80211/patches/543-ath9k_entropy_from_adc.patch

@@ -65,7 +65,7 @@
  }
  
  static const struct ieee80211_iface_limit if_limits[] = {
-@@ -903,6 +904,18 @@ static void ath9k_set_hw_capab(struct at
+@@ -904,6 +905,18 @@ static void ath9k_set_hw_capab(struct at
  	SET_IEEE80211_PERM_ADDR(hw, common->macaddr);
  }
  
@@ -84,7 +84,7 @@
  int ath9k_init_device(u16 devid, struct ath_softc *sc,
  		    const struct ath_bus_ops *bus_ops)
  {
-@@ -948,6 +961,8 @@ int ath9k_init_device(u16 devid, struct
+@@ -949,6 +962,8 @@ int ath9k_init_device(u16 devid, struct
  		ARRAY_SIZE(ath9k_tpt_blink));
  #endif