mwl8k: Fix the firmware hang issue for 8764
The firmware hang issue is not seen very often, though it is still seen sometimes (once in 12 hours in local tests). The changes in the driver ,to interrupt the firmware, are needed when we detect that firmware is stuck and when the host queues are full and we begin to drop packets. This is to ensure that the firmware does not miss any PPA_RDY interrupts to cause the firmware restart dont miss PPA_READY interrupt for SC2 Signed-off-by: Nishant Sarmukadam <nishants@marvell.com> Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -1548,7 +1548,7 @@ static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
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if (!priv->pending_tx_pkts)
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return 0;
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retry = 0;
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retry = 1;
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rc = 0;
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spin_lock_bh(&priv->tx_lock);
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@ -1572,13 +1572,19 @@ static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
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spin_lock_bh(&priv->tx_lock);
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if (timeout) {
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if (timeout || !priv->pending_tx_pkts) {
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WARN_ON(priv->pending_tx_pkts);
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if (retry)
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wiphy_notice(hw->wiphy, "tx rings drained\n");
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break;
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}
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if (retry) {
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mwl8k_tx_start(priv);
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retry = 0;
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continue;
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}
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if (priv->pending_tx_pkts < oldcount) {
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wiphy_notice(hw->wiphy,
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"waiting for tx rings to drain (%d -> %d pkts)\n",
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@ -2055,6 +2061,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw,
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mwl8k_remove_stream(hw, stream);
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spin_unlock(&priv->stream_lock);
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}
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mwl8k_tx_start(priv);
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spin_unlock_bh(&priv->tx_lock);
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pci_unmap_single(priv->pdev, dma, skb->len,
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PCI_DMA_TODEVICE);
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