linux-kernel - [PATCH 1/2] mac80211: add tx dequeue function for process context

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190617200140.6189-1-erik.stromdahl@gmail.com>
Date:   Mon, 17 Jun 2019 22:01:39 +0200
From:   Erik Stromdahl <erik.stromdahl@...il.com>
To:     johannes@...solutions.net, kvalo@...eaurora.org,
        davem@...emloft.net, linux-wireless@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Erik Stromdahl <erik.stromdahl@...il.com>
Subject: [PATCH 1/2] mac80211: add tx dequeue function for process context

Since ieee80211_tx_dequeue() must not be called with softirqs enabled
(i.e. from process context without proper disable of bottom halves),
we add a wrapper that disables bottom halves before calling
ieee80211_tx_dequeue()

The new function is named ieee80211_tx_dequeue_ni() just as all other
from-process-context versions found in mac80211.

The documentation of ieee80211_tx_dequeue() is also updated so it
mentions that the function should not be called from process context.

Signed-off-by: Erik Stromdahl <erik.stromdahl@...il.com>
---
 include/net/mac80211.h | 26 ++++++++++++++++++++++++++
 net/mac80211/tx.c      |  2 ++
 2 files changed, 28 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 72080d9d617e..c47990d8db79 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -6251,10 +6251,36 @@ void ieee80211_unreserve_tid(struct ieee80211_sta *sta, u8 tid);
  * but for the duration of the frame handling.
  * However, also note that while in the wake_tx_queue() method,
  * rcu_read_lock() is already held.
+ *
+ * softirqs must also be disabled when this function is called.
+ * In process context, use ieee80211_tx_dequeue_ni() instead.
  */
 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 				     struct ieee80211_txq *txq);
 
+/**
+ * ieee80211_tx_dequeue_ni - dequeue a packet from a software tx queue
+ * (in process context)
+ *
+ * Like ieee80211_tx_dequeue() but can be called in process context
+ * (internally disables bottom halves).
+ *
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ * @txq: pointer obtained from station or virtual interface, or from
+ *	ieee80211_next_txq()
+ */
+static inline struct sk_buff *ieee80211_tx_dequeue_ni(struct ieee80211_hw *hw,
+						      struct ieee80211_txq *txq)
+{
+	struct sk_buff *skb;
+
+	local_bh_disable();
+	skb = ieee80211_tx_dequeue(hw, txq);
+	local_bh_enable();
+
+	return skb;
+}
+
 /**
  * ieee80211_next_txq - get next tx queue to pull packets from
  *
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index dd220b977025..4bd0066ea7cd 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3550,6 +3550,8 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 	ieee80211_tx_result r;
 	struct ieee80211_vif *vif = txq->vif;
 
+	WARN_ON_ONCE(softirq_count() == 0);
+
 begin:
 	spin_lock_bh(&fq->lock);
 
-- 
2.22.0