[lantiq] fixes irq locking in ethernet driver

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30522 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/lantiq/patches/850-etop_irq.patch b/target/linux/lantiq/patches/850-etop_irq.patch
new file mode 100644 (file)
index 0000000..d0b8645
--- /dev/null
+++ b/target/linux/lantiq/patches/850-etop_irq.patch
@@ -0,0 +1,71 @@
+Index: linux-3.1.10/drivers/net/lantiq_etop.c
+===================================================================
+--- linux-3.1.10.orig/drivers/net/lantiq_etop.c        2012-02-09 10:07:01.180680919 +0100
++++ linux-3.1.10/drivers/net/lantiq_etop.c     2012-02-09 10:11:00.996691173 +0100
+@@ -203,8 +203,10 @@
+ {
+       struct ltq_etop_chan *ch = container_of(napi,
+                               struct ltq_etop_chan, napi);
++      struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
+       int rx = 0;
+       int complete = 0;
++      unsigned long flags;
+ 
+       while ((rx < budget) && !complete) {
+               struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
+@@ -218,7 +220,9 @@
+       }
+       if (complete || !rx) {
+               napi_complete(&ch->napi);
++              spin_lock_irqsave(&priv->lock, flags);
+               ltq_dma_ack_irq(&ch->dma);
++              spin_unlock_irqrestore(&priv->lock, flags);
+       }
+       return rx;
+ }
+@@ -248,7 +252,9 @@
+       if (netif_tx_queue_stopped(txq))
+               netif_tx_start_queue(txq);
+       napi_complete(&ch->napi);
++      spin_lock_irqsave(&priv->lock, flags);
+       ltq_dma_ack_irq(&ch->dma);
++      spin_unlock_irqrestore(&priv->lock, flags);
+       return 1;
+ }
+ 
+@@ -615,13 +621,17 @@
+ {
+       struct ltq_etop_priv *priv = netdev_priv(dev);
+       int i;
++      unsigned long flags;
+ 
+       for (i = 0; i < MAX_DMA_CHAN; i++) {
+               struct ltq_etop_chan *ch = &priv->ch[i];
+ 
+               if (!IS_TX(i) && (!IS_RX(i)))
+                       continue;
++              spin_lock_irqsave(&priv->lock, flags);
+               ltq_dma_open(&ch->dma);
++              ltq_dma_ack_irq(&ch->dma);
++              spin_unlock_irqrestore(&priv->lock, flags);
+               napi_enable(&ch->napi);
+       }
+       if (priv->phydev)
+@@ -635,6 +645,7 @@
+ {
+       struct ltq_etop_priv *priv = netdev_priv(dev);
+       int i;
++      unsigned long flags;
+ 
+       netif_tx_stop_all_queues(dev);
+       if (priv->phydev)
+@@ -645,7 +656,9 @@
+               if (!IS_RX(i) && !IS_TX(i))
+                       continue;
+               napi_disable(&ch->napi);
++              spin_lock_irqsave(&priv->lock, flags);
+               ltq_dma_close(&ch->dma);
++              spin_unlock_irqrestore(&priv->lock, flags);
+       }
+       return 0;
+ }