[PATCH] ath10k: restore tx sk_buff of htt header for SDIO

[Wen Gong]

ieee80211_report_used_skb of mac80211 use the frame_control of
ieee80211_hdr in sk_buff and indicate it to another function
ieee80211_mgd_conn_tx_status, then it queue work ieee80211_sta_work,
but ieee80211_is_auth(fc) in ieee80211_sta_work check fail when the
authentication has transmitted by ath10k.

When the ath10k report it with HTT_TX_COMPL_STATE_DISCARD, it will be
set without flag IEEE80211_TX_STAT_ACK, then mac80211 should try the
next authentication immeditely, but in fact mac80211 wait 1 second for
it, the reason is ieee80211_is_auth(fc) in ieee80211_sta_work check
fail for the sk_buff which is not restored, the data of sk_buff is not
the begin of ieee80211_hdr, in fact it is the begin of htt_cmd_hdr.

dmesg without this patch, it wait 1 second for the next retry when
ath10k report without IEEE80211_TX_STAT_ACK for authentication:
[ 6973.883116] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 1/3)
[ 6974.705471] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 2/3)
[ 6975.712962] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 3/3)

Restore the sk_buff make mac8011 retry the next authentication
immeditely which meet logic of mac80211.

dmesg with this patch, it retry the next immeditely when ath10k
report without IEEE80211_TX_STAT_ACK for authentication:
[  216.734813] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 1/3)
[  216.739914] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 2/3)
[  216.745874] wlan0: send auth to 5e:6f:2b:0d:fb:d7 (try 3/3)

Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00049

Signed-off-by: Wen Gong <wgong at codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/htt_tx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
index 9a109840a4c9..44c617834c56 100644
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -573,6 +573,8 @@ void ath10k_htt_htc_tx_complete(struct ath10k *ar, struct sk_buff *skb)
 			desc_hdr = (struct htt_data_tx_desc *)
 				(skb->data + sizeof(*htt_hdr));
 			flags1 = __le16_to_cpu(desc_hdr->flags1);
+			skb_pull(skb, sizeof(struct htt_cmd_hdr));
+			skb_pull(skb, sizeof(struct htt_data_tx_desc));
 		}
 	}
 
-- 
2.27.0