Revert "rtl8180: use NAPI for bottom-half processing"

This reverts commit 030725d2c7c1fafec7ede618647bf30ed79601f0.

This commit relies on commit 5ed3bc7288487bd4f891f420a07319e0b538b4fe
("mac80211: use netif_receive_skb in ieee80211_tx_status callpath")
Unfortunately not all drivers are calling ieee80211_tx_status from a
compatible context, so that commit needs to be reverted in 2.6.36.

Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 59 insertions, 69 deletions

diff --git a/drivers/net/wireless/rtl818x/rtl8180_dev.c b/drivers/net/wireless/rtl818x/rtl8180_dev.c
index 05c6bad..707c688 100644
--- a/drivers/net/wireless/rtl818x/rtl8180_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8180_dev.c
@@ -99,66 +99,19 @@ void rtl8180_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data)
 	}
 }
 
-static void rtl8180_handle_tx(struct ieee80211_hw *dev)
+static void rtl8180_handle_rx(struct ieee80211_hw *dev)
 {
 	struct rtl8180_priv *priv = dev->priv;
-	struct rtl8180_tx_ring *ring;
-	int prio;
-
-	spin_lock(&priv->lock);
-
-	for (prio = 3; prio >= 0; prio--) {
-		ring = &priv->tx_ring[prio];
-
-		while (skb_queue_len(&ring->queue)) {
-			struct rtl8180_tx_desc *entry = &ring->desc[ring->idx];
-			struct sk_buff *skb;
-			struct ieee80211_tx_info *info;
-			u32 flags = le32_to_cpu(entry->flags);
-
-			if (flags & RTL818X_TX_DESC_FLAG_OWN)
-				break;
-
-			ring->idx = (ring->idx + 1) % ring->entries;
-			skb = __skb_dequeue(&ring->queue);
-			pci_unmap_single(priv->pdev, le32_to_cpu(entry->tx_buf),
-					 skb->len, PCI_DMA_TODEVICE);
-
-			info = IEEE80211_SKB_CB(skb);
-			ieee80211_tx_info_clear_status(info);
-
-			if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
-			    (flags & RTL818X_TX_DESC_FLAG_TX_OK))
-				info->flags |= IEEE80211_TX_STAT_ACK;
-
-			info->status.rates[0].count = (flags & 0xFF) + 1;
-			info->status.rates[1].idx = -1;
-
-			ieee80211_tx_status(dev, skb);
-			if (ring->entries - skb_queue_len(&ring->queue) == 2)
-				ieee80211_wake_queue(dev, prio);
-		}
-	}
-
-	spin_unlock(&priv->lock);
-}
-
-static int rtl8180_poll(struct ieee80211_hw *dev, int budget)
-{
-	struct rtl8180_priv *priv = dev->priv;
-	unsigned int count = 0;
+	unsigned int count = 32;
 	u8 signal, agc, sq;
 
-	/* handle pending Tx queue cleanup */
-	rtl8180_handle_tx(dev);
-
-	while (count++ < budget) {
+	while (count--) {
 		struct rtl8180_rx_desc *entry = &priv->rx_ring[priv->rx_idx];
 		struct sk_buff *skb = priv->rx_buf[priv->rx_idx];
 		u32 flags = le32_to_cpu(entry->flags);
 
 		if (flags & RTL818X_RX_DESC_FLAG_OWN)
-			break;
+			return;
 
 		if (unlikely(flags & (RTL818X_RX_DESC_FLAG_DMA_FAIL |
 				      RTL818X_RX_DESC_FLAG_FOF |
@@ -198,7 +151,7 @@ static int rtl8180_poll(struct ieee80211_hw *dev, int budget)
 				rx_status.flag |= RX_FLAG_FAILED_FCS_CRC;
 
 			memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
-			ieee80211_rx(dev, skb);
+			ieee80211_rx_irqsafe(dev, skb);
 
 			skb = new_skb;
 			priv->rx_buf[priv->rx_idx] = skb;
@@ -215,16 +168,41 @@ static int rtl8180_poll(struct ieee80211_hw *dev, int budget)
 			entry->flags |= cpu_to_le32(RTL818X_RX_DESC_FLAG_EOR);
 		priv->rx_idx = (priv->rx_idx + 1) % 32;
 	}
+}
+
+static void rtl8180_handle_tx(struct ieee80211_hw *dev, unsigned int prio)
+{
+	struct rtl8180_priv *priv = dev->priv;
+	struct rtl8180_tx_ring *ring = &priv->tx_ring[prio];
 
-	if (count < budget) {
-		/* disable polling */
-		ieee80211_napi_complete(dev);
+	while (skb_queue_len(&ring->queue)) {
+		struct rtl8180_tx_desc *entry = &ring->desc[ring->idx];
+		struct sk_buff *skb;
+		struct ieee80211_tx_info *info;
+		u32 flags = le32_to_cpu(entry->flags);
 
-		/* enable interrupts */
-		rtl818x_iowrite16(priv, &priv->map->INT_MASK, 0xFFFF);
-	}
+		if (flags & RTL818X_TX_DESC_FLAG_OWN)
+			return;
+
+		ring->idx = (ring->idx + 1) % ring->entries;
+		skb = __skb_dequeue(&ring->queue);
+		pci_unmap_single(priv->pdev, le32_to_cpu(entry->tx_buf),
+				 skb->len, PCI_DMA_TODEVICE);
+
+		info = IEEE80211_SKB_CB(skb);
+		ieee80211_tx_info_clear_status(info);
+
+		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
+		    (flags & RTL818X_TX_DESC_FLAG_TX_OK))
+			info->flags |= IEEE80211_TX_STAT_ACK;
+
+		info->status.rates[0].count = (flags & 0xFF) + 1;
+		info->status.rates[1].idx = -1;
 
-	return count;
+		ieee80211_tx_status_irqsafe(dev, skb);
+		if (ring->entries - skb_queue_len(&ring->queue) == 2)
+			ieee80211_wake_queue(dev, prio);
+	}
 }
 
 static irqreturn_t rtl8180_interrupt(int irq, void *dev_id)
@@ -233,17 +211,31 @@ static irqreturn_t rtl8180_interrupt(int irq, void *dev_id)
 	struct rtl8180_priv *priv = dev->priv;
 	u16 reg;
 
+	spin_lock(&priv->lock);
 	reg = rtl818x_ioread16(priv, &priv->map->INT_STATUS);
-	if (unlikely(reg == 0xFFFF))
+	if (unlikely(reg == 0xFFFF)) {
+		spin_unlock(&priv->lock);
 		return IRQ_HANDLED;
+	}
 
 	rtl818x_iowrite16(priv, &priv->map->INT_STATUS, reg);
 
-	/* disable interrupts */
-	rtl818x_iowrite16(priv, &priv->map->INT_MASK, 0);
+	if (reg & (RTL818X_INT_TXB_OK | RTL818X_INT_TXB_ERR))
+		rtl8180_handle_tx(dev, 3);
+
+	if (reg & (RTL818X_INT_TXH_OK | RTL818X_INT_TXH_ERR))
+		rtl8180_handle_tx(dev, 2);
+
+	if (reg & (RTL818X_INT_TXN_OK | RTL818X_INT_TXN_ERR))
+		rtl8180_handle_tx(dev, 1);
 
-	/* enable polling */
-	ieee80211_napi_schedule(dev);
+	if (reg & (RTL818X_INT_TXL_OK | RTL818X_INT_TXL_ERR))
+		rtl8180_handle_tx(dev, 0);
+
+	if (reg & (RTL818X_INT_RX_OK | RTL818X_INT_RX_ERR))
+		rtl8180_handle_rx(dev);
+
+	spin_unlock(&priv->lock);
 
 	return IRQ_HANDLED;
 }
@@ -255,6 +247,7 @@ static int rtl8180_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 	struct rtl8180_priv *priv = dev->priv;
 	struct rtl8180_tx_ring *ring;
 	struct rtl8180_tx_desc *entry;
+	unsigned long flags;
 	unsigned int idx, prio;
 	dma_addr_t mapping;
 	u32 tx_flags;
@@ -301,7 +294,7 @@ static int rtl8180_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 			plcp_len |= 1 << 15;
 	}
 
-	spin_lock(&priv->lock);
+	spin_lock_irqsave(&priv->lock, flags);
 
 	if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
 		if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
@@ -325,7 +318,7 @@ static int rtl8180_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
 	if (ring->entries - skb_queue_len(&ring->queue) < 2)
 		ieee80211_stop_queue(dev, prio);
 
-	spin_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->lock, flags);
 
 	rtl818x_iowrite8(priv, &priv->map->TX_DMA_POLLING, (1 << (prio + 4)));
 
@@ -871,7 +864,6 @@ static const struct ieee80211_ops rtl8180_ops = {
 	.prepare_multicast	= rtl8180_prepare_multicast,
 	.configure_filter	= rtl8180_configure_filter,
 	.get_tsf		= rtl8180_get_tsf,
-	.napi_poll		= rtl8180_poll,
 };
 
 static void rtl8180_eeprom_register_read(struct eeprom_93cx6 *eeprom)
@@ -1003,8 +995,6 @@ static int __devinit rtl8180_probe(struct pci_dev *pdev,
 	dev->queues = 1;
 	dev->max_signal = 65;
 
-	dev->napi_weight = 64;
-
 	reg = rtl818x_ioread32(priv, &priv->map->TX_CONF);
 	reg &= RTL818X_TX_CONF_HWVER_MASK;
 	switch (reg) {