linux-kernel - [PATCH AUTOSEL for 4.9 183/293] iwlwifi: mvm: don't send fetch the TID from a non-QoS packet in TSO

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Date:   Mon, 9 Apr 2018 00:25:17 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 183/293] iwlwifi: mvm: don't send fetch the
 TID from a non-QoS packet in TSO

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

[ Upstream commit 4f555e602b42826b3d79081c9ef8b8e8fe29fc49 ]

Getting the TID of a packet before we know it is a QoS data
packet isn't a good idea. Delay the TID retrieval until
we know the packet is a QoS data packet.

Fixes: bb81bb68f472 ("iwlwifi: mvm: add Tx A-MSDU inside A-MPDU")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index 7465d4db136f..790952e48262 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -652,11 +652,6 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
 	snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
 		tcp_hdrlen(skb);
 
-	qc = ieee80211_get_qos_ctl(hdr);
-	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
-	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
-		return -EINVAL;
-
 	dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len);
 
 	if (!sta->max_amsdu_len ||
@@ -667,6 +662,11 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
 		goto segment;
 	}
 
+	qc = ieee80211_get_qos_ctl(hdr);
+	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
+	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
+		return -EINVAL;
+
 	/*
 	 * Do not build AMSDU for IPv6 with extension headers.
 	 * ask stack to segment and checkum the generated MPDUs for us.
-- 
2.15.1