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[81.233.89.221]) by smtp.gmail.com with ESMTPSA id j90sm2245780ljb.29.2019.06.17.13.02.21 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 17 Jun 2019 13:02:22 -0700 (PDT) From: Erik Stromdahl To: johannes@sipsolutions.net, kvalo@codeaurora.org, davem@davemloft.net, linux-wireless@vger.kernel.org, ath10k@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Erik Stromdahl Subject: [PATCH 1/2] mac80211: add tx dequeue function for process context Date: Mon, 17 Jun 2019 22:01:39 +0200 Message-Id: <20190617200140.6189-1-erik.stromdahl@gmail.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- 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);