diff options
Diffstat (limited to 'target/linux/ar7/patches-2.6.25/140-cpmac_fix.patch')
| -rw-r--r-- | target/linux/ar7/patches-2.6.25/140-cpmac_fix.patch | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/target/linux/ar7/patches-2.6.25/140-cpmac_fix.patch b/target/linux/ar7/patches-2.6.25/140-cpmac_fix.patch new file mode 100644 index 0000000000..2435b3518e --- /dev/null +++ b/target/linux/ar7/patches-2.6.25/140-cpmac_fix.patch @@ -0,0 +1,169 @@ +Index: linux-2.6.25.1/drivers/net/cpmac.c +=================================================================== +--- linux-2.6.25.1.orig/drivers/net/cpmac.c 2008-05-01 23:45:25.000000000 +0200 ++++ linux-2.6.25.1/drivers/net/cpmac.c 2008-05-03 16:21:17.000000000 +0200 +@@ -38,6 +38,7 @@ + #include <linux/platform_device.h> + #include <linux/dma-mapping.h> + #include <asm/gpio.h> ++#include <asm/atomic.h> + + MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>"); + MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)"); +@@ -207,6 +208,7 @@ + struct work_struct reset_work; + struct platform_device *pdev; + struct napi_struct napi; ++ atomic_t reset_pending; + }; + + static irqreturn_t cpmac_irq(int, void *); +@@ -455,6 +457,9 @@ + struct cpmac_desc *desc; + struct cpmac_priv *priv = netdev_priv(dev); + ++ if (unlikely(atomic_read(&priv->reset_pending))) ++ return NETDEV_TX_BUSY; ++ + if (unlikely(skb_padto(skb, ETH_ZLEN))) + return NETDEV_TX_OK; + +@@ -634,14 +639,14 @@ + priv->desc_ring[i].dataflags = 0; + if (priv->desc_ring[i].skb) { + dev_kfree_skb_any(priv->desc_ring[i].skb); +- if (netif_subqueue_stopped(dev, i)) +- netif_wake_subqueue(dev, i); ++ priv->desc_ring[i].skb = NULL; + } + } + } + + static void cpmac_hw_error(struct work_struct *work) + { ++ int i; + struct cpmac_priv *priv = + container_of(work, struct cpmac_priv, reset_work); + +@@ -650,8 +655,47 @@ + spin_unlock(&priv->rx_lock); + cpmac_clear_tx(priv->dev); + cpmac_hw_start(priv->dev); +- napi_enable(&priv->napi); +- netif_start_queue(priv->dev); ++ barrier(); ++ atomic_dec(&priv->reset_pending); ++ ++ for (i = 0; i < CPMAC_QUEUES; i++) { ++ netif_wake_subqueue(priv->dev, i); ++ } ++ netif_wake_queue(priv->dev); ++ cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3); ++} ++ ++static void cpmac_check_status(struct net_device *dev) ++{ ++ struct cpmac_priv *priv = netdev_priv(dev); ++ ++ u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS); ++ int rx_channel = (macstatus >> 8) & 7; ++ int rx_code = (macstatus >> 12) & 15; ++ int tx_channel = (macstatus >> 16) & 7; ++ int tx_code = (macstatus >> 20) & 15; ++ ++ if (rx_code || tx_code) { ++ if (netif_msg_drv(priv) && net_ratelimit()) { ++ /* Can't find any documentation on what these error codes actually are. ++ * So just log them and hope.. ++ */ ++ if (rx_code) ++ printk(KERN_WARNING "%s: host error %d on rx channel %d (macstatus %08x), resetting\n", ++ dev->name, rx_code, rx_channel, macstatus); ++ if (tx_code) ++ printk(KERN_WARNING "%s: host error %d on tx channel %d (macstatus %08x), resetting\n", ++ dev->name, tx_code, tx_channel, macstatus); ++ } ++ ++ netif_stop_queue(dev); ++ cpmac_hw_stop(dev); ++ if (schedule_work(&priv->reset_work)) ++ atomic_inc(&priv->reset_pending); ++ if (unlikely(netif_msg_hw(priv))) ++ cpmac_dump_regs(dev); ++ } ++ cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff); + } + + static irqreturn_t cpmac_irq(int irq, void *dev_id) +@@ -682,49 +726,33 @@ + + cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0); + +- if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS))) { +- if (netif_msg_drv(priv) && net_ratelimit()) +- printk(KERN_ERR "%s: hw error, resetting...\n", +- dev->name); +- netif_stop_queue(dev); +- napi_disable(&priv->napi); +- cpmac_hw_stop(dev); +- schedule_work(&priv->reset_work); +- if (unlikely(netif_msg_hw(priv))) +- cpmac_dump_regs(dev); +- } ++ if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS))) ++ cpmac_check_status(dev); + + return IRQ_HANDLED; + } + + static void cpmac_tx_timeout(struct net_device *dev) + { +- struct cpmac_priv *priv = netdev_priv(dev); + int i; ++ struct cpmac_priv *priv = netdev_priv(dev); + + spin_lock(&priv->lock); + dev->stats.tx_errors++; + spin_unlock(&priv->lock); + if (netif_msg_tx_err(priv) && net_ratelimit()) + printk(KERN_WARNING "%s: transmit timeout\n", dev->name); +- /* +- * FIXME: waking up random queue is not the best thing to +- * do... on the other hand why we got here at all? +- */ +-#ifdef CONFIG_NETDEVICES_MULTIQUEUE +- for (i = 0; i < CPMAC_QUEUES; i++) +- if (priv->desc_ring[i].skb) { +- priv->desc_ring[i].dataflags = 0; +- dev_kfree_skb_any(priv->desc_ring[i].skb); +- netif_wake_subqueue(dev, i); +- break; +- } +-#else +- priv->desc_ring[0].dataflags = 0; +- if (priv->desc_ring[0].skb) +- dev_kfree_skb_any(priv->desc_ring[0].skb); +- netif_wake_queue(dev); +-#endif ++ ++ atomic_inc(&priv->reset_pending); ++ barrier(); ++ cpmac_clear_tx(dev); ++ barrier(); ++ atomic_dec(&priv->reset_pending); ++ ++ netif_wake_queue(priv->dev); ++ for (i = 0; i < CPMAC_QUEUES; i++) { ++ netif_wake_subqueue(dev, i); ++ } + } + + static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +@@ -911,6 +939,7 @@ + goto fail_irq; + } + ++ atomic_set(&priv->reset_pending, 0); + INIT_WORK(&priv->reset_work, cpmac_hw_error); + cpmac_hw_start(dev); + |