qtnfmac: lock access to h/w in tx path

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 <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c b/drivers/net/wireless/quantenna/qtnfmac/pearl/pcie.c
index 502e72b..6913196 100644 (file)
--- 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 @@ tx_done:
                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 e76a237..86ac1cc 100644 (file)
--- 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;