Return-path: Received: from mail-bn3nam01on0044.outbound.protection.outlook.com ([104.47.33.44]:39568 "EHLO NAM01-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751370AbdIOLxa (ORCPT ); Fri, 15 Sep 2017 07:53:30 -0400 From: Sergey Matyukevich To: linux-wireless@vger.kernel.org Cc: Igor Mitsyanko , Avinash Patil , Sergey Matyukevich Subject: [PATCH 1/2] qtnfmac: lock access to h/w in tx path Date: Fri, 15 Sep 2017 14:52:59 +0300 Message-Id: <20170915115300.12719-2-sergey.matyukevich.os@quantenna.com> (sfid-20170915_135335_622473_0B1EBB10) In-Reply-To: <20170915115300.12719-1-sergey.matyukevich.os@quantenna.com> References: <20170915115300.12719-1-sergey.matyukevich.os@quantenna.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-wireless-owner@vger.kernel.org List-ID: Fix tx path regression. Lock should be held when queuing packets to h/w fifos in order to properly handle configurations with multiple enabled interfaces. Signed-off-by: Sergey Matyukevich --- drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c | 9 ++++++++- drivers/net/wireless/quantenna/qtnfmac/pearl/pcie_bus_priv.h | 2 ++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c b/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c index 502e72b7cdcc..69131965a298 100644 --- a/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c +++ b/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c @@ -661,14 +661,18 @@ static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb) struct qtnf_pcie_bus_priv *priv = (void *)get_bus_priv(bus); dma_addr_t txbd_paddr, skb_paddr; struct qtnf_tx_bd *txbd; + unsigned long flags; int len, i; u32 info; int ret = 0; + spin_lock_irqsave(&priv->tx0_lock, flags); + if (!qtnf_tx_queue_ready(priv)) { if (skb->dev) netif_stop_queue(skb->dev); + spin_unlock_irqrestore(&priv->tx0_lock, flags); return NETDEV_TX_BUSY; } @@ -717,8 +721,10 @@ static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb) dev_kfree_skb_any(skb); } - qtnf_pcie_data_tx_reclaim(priv); priv->tx_done_count++; + spin_unlock_irqrestore(&priv->tx0_lock, flags); + + qtnf_pcie_data_tx_reclaim(priv); return NETDEV_TX_OK; } @@ -1247,6 +1253,7 @@ static int qtnf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id) strcpy(bus->fwname, QTN_PCI_PEARL_FW_NAME); init_completion(&bus->request_firmware_complete); mutex_init(&bus->bus_lock); + spin_lock_init(&pcie_priv->tx0_lock); spin_lock_init(&pcie_priv->irq_lock); spin_lock_init(&pcie_priv->tx_reclaim_lock); diff --git a/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie_bus_priv.h b/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie_bus_priv.h index e76a23716ee0..86ac1ccedb52 100644 --- a/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie_bus_priv.h +++ b/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie_bus_priv.h @@ -34,6 +34,8 @@ struct qtnf_pcie_bus_priv { /* lock for tx reclaim operations */ spinlock_t tx_reclaim_lock; + /* lock for tx0 operations */ + spinlock_t tx0_lock; u8 msi_enabled; int mps; -- 2.11.0