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Date: Thu, 29 Dec 2011 23:00:33 +0100
From: Bjarke Istrup Pedersen <gurligebis@...too.org>
To: Francois Romieu <romieu@...zoreil.com>
Cc: David Miller <davem@...emloft.net>, shemminger@...tta.com,
bhutchings@...arflare.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, rl@...lgate.ch
Subject: Re: [PATCH 1/1] via-rhine: Fix hanging with high CPU load on low-end broads.
2011/12/29 Francois Romieu <romieu@...zoreil.com>:
> Francois Romieu <romieu@...zoreil.com> :
> [...]
>> Feel free to try the extra "new year's eve week end is getting closer"
>> patch below (against net-next).
>>
>> You have been warned.
>
> The one below could be a bit better.
>
> Out for dinner.
Thanks, I'll try that one in a while, once I'm done bisecting 3.1.4 ->
3.1.5, since all kernels after 3.1.4 won't pass control onto init.
/Bjarke
> diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
> index 5c4983b..66e5c08 100644
> --- a/drivers/net/ethernet/via/via-rhine.c
> +++ b/drivers/net/ethernet/via/via-rhine.c
> @@ -42,7 +42,8 @@
>
> #define DEBUG
> static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */
> -static int max_interrupt_work = 20;
> +#define RHINE_MSG_DEFAULT \
> + (NETIF_MSG_INTR)
>
> /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
> Setting to > 1518 effectively disables this feature. */
> @@ -128,11 +129,9 @@ MODULE_AUTHOR("Donald Becker <becker@...ld.com>");
> MODULE_DESCRIPTION("VIA Rhine PCI Fast Ethernet driver");
> MODULE_LICENSE("GPL");
>
> -module_param(max_interrupt_work, int, 0);
> module_param(debug, int, 0);
> module_param(rx_copybreak, int, 0);
> module_param(avoid_D3, bool, 0);
> -MODULE_PARM_DESC(max_interrupt_work, "VIA Rhine maximum events handled per interrupt");
> MODULE_PARM_DESC(debug, "VIA Rhine debug level (0-7)");
> MODULE_PARM_DESC(rx_copybreak, "VIA Rhine copy breakpoint for copy-only-tiny-frames");
> MODULE_PARM_DESC(avoid_D3, "Avoid power state D3 (work-around for broken BIOSes)");
> @@ -351,16 +350,25 @@ static const int mmio_verify_registers[] = {
>
> /* Bits in the interrupt status/mask registers. */
> enum intr_status_bits {
> - IntrRxDone=0x0001, IntrRxErr=0x0004, IntrRxEmpty=0x0020,
> - IntrTxDone=0x0002, IntrTxError=0x0008, IntrTxUnderrun=0x0210,
> - IntrPCIErr=0x0040,
> - IntrStatsMax=0x0080, IntrRxEarly=0x0100,
> - IntrRxOverflow=0x0400, IntrRxDropped=0x0800, IntrRxNoBuf=0x1000,
> - IntrTxAborted=0x2000, IntrLinkChange=0x4000,
> - IntrRxWakeUp=0x8000,
> - IntrNormalSummary=0x0003, IntrAbnormalSummary=0xC260,
> - IntrTxDescRace=0x080000, /* mapped from IntrStatus2 */
> - IntrTxErrSummary=0x082218,
> + IntrRxDone = 0x0001,
> + IntrTxDone = 0x0002,
> + IntrRxErr = 0x0004,
> + IntrTxError = 0x0008,
> + IntrRxEmpty = 0x0020,
> + IntrPCIErr = 0x0040,
> + IntrStatsMax = 0x0080,
> + IntrRxEarly = 0x0100,
> + IntrTxUnderrun = 0x0210,
> + IntrRxOverflow = 0x0400,
> + IntrRxDropped = 0x0800,
> + IntrRxNoBuf = 0x1000,
> + IntrTxAborted = 0x2000,
> + IntrLinkChange = 0x4000,
> + IntrRxWakeUp = 0x8000,
> + IntrTxDescRace = 0x080000, /* mapped from IntrStatus2 */
> + IntrNormalSummary = IntrRxDone | IntrTxDone,
> + IntrTxErrSummary = IntrTxDescRace | IntrTxAborted | IntrTxError |
> + IntrTxUnderrun,
> };
>
> /* Bits in WOLcrSet/WOLcrClr and PwrcsrSet/PwrcsrClr */
> @@ -439,8 +447,12 @@ struct rhine_private {
> struct net_device *dev;
> struct napi_struct napi;
> spinlock_t lock;
> + struct mutex task_lock;
> + struct work_struct slow_event_task;
> struct work_struct reset_task;
>
> + u32 msg_enable;
> +
> /* Frequently used values: keep some adjacent for cache effect. */
> u32 quirks;
> struct rx_desc *rx_head_desc;
> @@ -482,7 +494,6 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
> static irqreturn_t rhine_interrupt(int irq, void *dev_instance);
> static void rhine_tx(struct net_device *dev);
> static int rhine_rx(struct net_device *dev, int limit);
> -static void rhine_error(struct net_device *dev, int intr_status);
> static void rhine_set_rx_mode(struct net_device *dev);
> static struct net_device_stats *rhine_get_stats(struct net_device *dev);
> static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
> @@ -497,6 +508,8 @@ static void rhine_set_cam_mask(void __iomem *ioaddr, u32 mask);
> static void rhine_set_vlan_cam_mask(void __iomem *ioaddr, u32 mask);
> static void rhine_init_cam_filter(struct net_device *dev);
> static void rhine_update_vcam(struct net_device *dev);
> +static void rhine_slow_event_task(struct work_struct *work);
> +static void rhine_restart_tx(struct net_device *dev);
>
> #define RHINE_WAIT_FOR(condition) \
> do { \
> @@ -508,7 +521,7 @@ do { \
> 1024 - i, __func__, __LINE__); \
> } while (0)
>
> -static inline u32 get_intr_status(struct net_device *dev)
> +static u32 get_intr_status(struct net_device *dev)
> {
> struct rhine_private *rp = netdev_priv(dev);
> void __iomem *ioaddr = rp->base;
> @@ -521,6 +534,16 @@ static inline u32 get_intr_status(struct net_device *dev)
> return intr_status;
> }
>
> +static void rhine_ack_event(struct rhine_private *rp, u32 mask)
> +{
> + void __iomem *ioaddr = rp->base;
> +
> + if (rp->quirks & rqStatusWBRace)
> + iowrite8(mask >> 16, ioaddr + IntrStatus2);
> + iowrite16(mask, ioaddr + IntrStatus);
> + mmiowb();
> +}
> +
> /*
> * Get power related registers into sane state.
> * Notify user about past WOL event.
> @@ -657,23 +680,127 @@ static void rhine_poll(struct net_device *dev)
> }
> #endif
>
> +static void rhine_kick_tx_threshold(struct rhine_private *rp)
> +{
> + if (rp->tx_thresh < 0xe0) {
> + void __iomem *ioaddr = rp->base;
> +
> + rp->tx_thresh += 0x20;
> + BYTE_REG_BITS_SET(rp->tx_thresh, 0x80, ioaddr + TxConfig);
> + }
> +}
> +
> +static void rhine_tx_err(struct rhine_private *rp, u32 status)
> +{
> + struct net_device *dev = rp->dev;
> +
> + if (status & IntrTxAborted) {
> + netif_info(rp, tx_err, dev,
> + "Abort %08x, frame dropped\n", status);
> + }
> +
> + if (status & IntrTxUnderrun) {
> + rhine_kick_tx_threshold(rp);
> + netif_info(rp, tx_err ,dev, "Transmitter underrun, "
> + "Tx threshold now %02x\n", rp->tx_thresh);
> + }
> +
> + if (status & IntrTxDescRace)
> + netif_info(rp, tx_err, dev, "Tx descriptor write-back race\n");
> +
> + if ((status & IntrTxError) &&
> + (status & (IntrTxAborted | IntrTxUnderrun | IntrTxDescRace)) == 0) {
> + rhine_kick_tx_threshold(rp);
> + netif_info(rp, tx_err, dev, "Unspecified error. "
> + "Tx threshold now %02x\n", rp->tx_thresh);
> + }
> +
> + rhine_restart_tx(dev);
> +}
> +
> +static void rhine_update_rx_crc_and_missed_errord(struct rhine_private *rp)
> +{
> + void __iomem *ioaddr = rp->base;
> + struct net_device_stats *stats = &rp->dev->stats;
> +
> + stats->rx_crc_errors += ioread16(ioaddr + RxCRCErrs);
> + stats->rx_missed_errors += ioread16(ioaddr + RxMissed);
> +
> + /*
> + * Clears the "tally counters" for CRC errors and missed frames(?).
> + * It has been reported that some chips need a write of 0 to clear
> + * these, for others the counters are set to 1 when written to and
> + * instead cleared when read. So we clear them both ways ...
> + */
> + iowrite32(0, ioaddr + RxMissed);
> + ioread16(ioaddr + RxCRCErrs);
> + ioread16(ioaddr + RxMissed);
> +}
> +
> +#define RHINE_EVENT_NAPI_RX (IntrRxDone | \
> + IntrRxErr | \
> + IntrRxEmpty | \
> + IntrRxOverflow | \
> + IntrRxDropped | \
> + IntrRxNoBuf | \
> + IntrRxWakeUp)
> +
> +#define RHINE_EVENT_NAPI_TX_ERR (IntrTxError | \
> + IntrTxAborted | \
> + IntrTxUnderrun | \
> + IntrTxDescRace)
> +#define RHINE_EVENT_NAPI_TX (IntrTxDone | RHINE_EVENT_NAPI_TX_ERR)
> +
> +#define RHINE_EVENT_NAPI (RHINE_EVENT_NAPI_RX | \
> + RHINE_EVENT_NAPI_TX | \
> + IntrStatsMax)
> +#define RHINE_EVENT_SLOW (IntrPCIErr | IntrLinkChange)
> +#define RHINE_EVENT (RHINE_EVENT_NAPI | RHINE_EVENT_SLOW)
> +
> static int rhine_napipoll(struct napi_struct *napi, int budget)
> {
> struct rhine_private *rp = container_of(napi, struct rhine_private, napi);
> struct net_device *dev = rp->dev;
> void __iomem *ioaddr = rp->base;
> - int work_done;
> + u16 enable_mask = RHINE_EVENT & 0xffff;
> + int work_done = 0;
> + u32 status;
> +
> + status = get_intr_status(dev);
> + rhine_ack_event(rp, status & ~RHINE_EVENT_SLOW);
> +
> + if (status & RHINE_EVENT_NAPI_RX)
> + work_done += rhine_rx(dev, budget);
> +
> + if (status & RHINE_EVENT_NAPI_TX) {
> + if (status & RHINE_EVENT_NAPI_TX_ERR) {
> + /* Avoid scavenging before Tx engine turned off */
> + RHINE_WAIT_FOR(!(ioread8(ioaddr + ChipCmd) & CmdTxOn));
> + if (ioread8(ioaddr + ChipCmd) & CmdTxOn)
> + netif_warn(rp, tx_err, dev, "Tx still on\n");
> + }
>
> - work_done = rhine_rx(dev, budget);
> + rhine_tx(dev);
> +
> + if (status & RHINE_EVENT_NAPI_TX_ERR)
> + rhine_tx_err(rp, status);
> + }
> +
> + if (status & IntrStatsMax) {
> + spin_lock(&rp->lock);
> + rhine_update_rx_crc_and_missed_errord(rp);
> + spin_unlock(&rp->lock);
> + }
> +
> + if (status & RHINE_EVENT_SLOW) {
> + enable_mask &= ~RHINE_EVENT_SLOW;
> + schedule_work(&rp->slow_event_task);
> + }
>
> if (work_done < budget) {
> napi_complete(napi);
> -
> - iowrite16(IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow |
> - IntrRxDropped | IntrRxNoBuf | IntrTxAborted |
> - IntrTxDone | IntrTxError | IntrTxUnderrun |
> - IntrPCIErr | IntrStatsMax | IntrLinkChange,
> - ioaddr + IntrEnable);
> + iowrite16(enable_mask, ioaddr + IntrEnable);
> + mmiowb();
> }
> return work_done;
> }
> @@ -797,6 +924,7 @@ static int __devinit rhine_init_one(struct pci_dev *pdev,
> rp->quirks = quirks;
> rp->pioaddr = pioaddr;
> rp->pdev = pdev;
> + rp->msg_enable = netif_msg_init(-1, RHINE_MSG_DEFAULT);
>
> rc = pci_request_regions(pdev, DRV_NAME);
> if (rc)
> @@ -856,7 +984,9 @@ static int __devinit rhine_init_one(struct pci_dev *pdev,
> dev->irq = pdev->irq;
>
> spin_lock_init(&rp->lock);
> + mutex_init(&rp->task_lock);
> INIT_WORK(&rp->reset_task, rhine_reset_task);
> + INIT_WORK(&rp->slow_event_task, rhine_slow_event_task);
>
> rp->mii_if.dev = dev;
> rp->mii_if.mdio_read = mdio_read;
> @@ -1310,12 +1440,7 @@ static void init_registers(struct net_device *dev)
>
> napi_enable(&rp->napi);
>
> - /* Enable interrupts by setting the interrupt mask. */
> - iowrite16(IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow |
> - IntrRxDropped | IntrRxNoBuf | IntrTxAborted |
> - IntrTxDone | IntrTxError | IntrTxUnderrun |
> - IntrPCIErr | IntrStatsMax | IntrLinkChange,
> - ioaddr + IntrEnable);
> + iowrite16(RHINE_EVENT & 0xffff, ioaddr + IntrEnable);
>
> iowrite16(CmdStart | CmdTxOn | CmdRxOn | (Cmd1NoTxPoll << 8),
> ioaddr + ChipCmd);
> @@ -1434,13 +1559,10 @@ static void rhine_reset_task(struct work_struct *work)
> reset_task);
> struct net_device *dev = rp->dev;
>
> - /* protect against concurrent rx interrupts */
> - disable_irq(rp->pdev->irq);
> + mutex_lock(&rp->task_lock);
>
> napi_disable(&rp->napi);
>
> - spin_lock_bh(&rp->lock);
> -
> /* clear all descriptors */
> free_tbufs(dev);
> free_rbufs(dev);
> @@ -1451,12 +1573,11 @@ static void rhine_reset_task(struct work_struct *work)
> rhine_chip_reset(dev);
> init_registers(dev);
>
> - spin_unlock_bh(&rp->lock);
> - enable_irq(rp->pdev->irq);
> -
> dev->trans_start = jiffies; /* prevent tx timeout */
> dev->stats.tx_errors++;
> netif_wake_queue(dev);
> +
> + mutex_unlock(&rp->task_lock);
> }
>
> static void rhine_tx_timeout(struct net_device *dev)
> @@ -1477,7 +1598,6 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
> struct rhine_private *rp = netdev_priv(dev);
> void __iomem *ioaddr = rp->base;
> unsigned entry;
> - unsigned long flags;
>
> /* Caution: the write order is important here, set the field
> with the "ownership" bits last. */
> @@ -1529,7 +1649,6 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
> rp->tx_ring[entry].tx_status = 0;
>
> /* lock eth irq */
> - spin_lock_irqsave(&rp->lock, flags);
> wmb();
> rp->tx_ring[entry].tx_status |= cpu_to_le32(DescOwn);
> wmb();
> @@ -1543,15 +1662,12 @@ static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
> BYTE_REG_BITS_ON(1 << 7, ioaddr + TQWake);
>
> /* Wake the potentially-idle transmit channel */
> - iowrite8(ioread8(ioaddr + ChipCmd1) | Cmd1TxDemand,
> - ioaddr + ChipCmd1);
> + iowrite8(ioread8(ioaddr + ChipCmd1) | Cmd1TxDemand, ioaddr + ChipCmd1);
> IOSYNC;
>
> if (rp->cur_tx == rp->dirty_tx + TX_QUEUE_LEN)
> netif_stop_queue(dev);
>
> - spin_unlock_irqrestore(&rp->lock, flags);
> -
> if (debug > 4) {
> netdev_dbg(dev, "Transmit frame #%d queued in slot %d\n",
> rp->cur_tx-1, entry);
> @@ -1565,63 +1681,26 @@ static irqreturn_t rhine_interrupt(int irq, void *dev_instance)
> {
> struct net_device *dev = dev_instance;
> struct rhine_private *rp = netdev_priv(dev);
> - void __iomem *ioaddr = rp->base;
> - u32 intr_status;
> - int boguscnt = max_interrupt_work;
> + u32 status;
> int handled = 0;
>
> - while ((intr_status = get_intr_status(dev))) {
> - handled = 1;
> -
> - /* Acknowledge all of the current interrupt sources ASAP. */
> - if (intr_status & IntrTxDescRace)
> - iowrite8(0x08, ioaddr + IntrStatus2);
> - iowrite16(intr_status & 0xffff, ioaddr + IntrStatus);
> - IOSYNC;
> -
> - if (debug > 4)
> - netdev_dbg(dev, "Interrupt, status %08x\n",
> - intr_status);
> -
> - if (intr_status & (IntrRxDone | IntrRxErr | IntrRxDropped |
> - IntrRxWakeUp | IntrRxEmpty | IntrRxNoBuf)) {
> - iowrite16(IntrTxAborted |
> - IntrTxDone | IntrTxError | IntrTxUnderrun |
> - IntrPCIErr | IntrStatsMax | IntrLinkChange,
> - ioaddr + IntrEnable);
> + status = get_intr_status(dev);
>
> - napi_schedule(&rp->napi);
> - }
> + netif_dbg(rp, intr, dev, "Interrupt, status %08x\n", status);
>
> - if (intr_status & (IntrTxErrSummary | IntrTxDone)) {
> - if (intr_status & IntrTxErrSummary) {
> - /* Avoid scavenging before Tx engine turned off */
> - RHINE_WAIT_FOR(!(ioread8(ioaddr+ChipCmd) & CmdTxOn));
> - if (debug > 2 &&
> - ioread8(ioaddr+ChipCmd) & CmdTxOn)
> - netdev_warn(dev,
> - "%s: Tx engine still on\n",
> - __func__);
> - }
> - rhine_tx(dev);
> - }
> + if (status & RHINE_EVENT) {
> + handled = 1;
>
> - /* Abnormal error summary/uncommon events handlers. */
> - if (intr_status & (IntrPCIErr | IntrLinkChange |
> - IntrStatsMax | IntrTxError | IntrTxAborted |
> - IntrTxUnderrun | IntrTxDescRace))
> - rhine_error(dev, intr_status);
> + iowrite16(0x0000, rp->base + IntrEnable);
> + mmiowb();
> + napi_schedule(&rp->napi);
> + }
>
> - if (--boguscnt < 0) {
> - netdev_warn(dev, "Too much work at interrupt, status=%#08x\n",
> - intr_status);
> - break;
> - }
> + if (status & ~(IntrLinkChange | IntrStatsMax | RHINE_EVENT_NAPI)) {
> + netif_err(rp, intr, dev, "Something Wicked happened! %08x\n",
> + status);
> }
>
> - if (debug > 3)
> - netdev_dbg(dev, "exiting interrupt, status=%08x\n",
> - ioread16(ioaddr + IntrStatus));
> return IRQ_RETVAL(handled);
> }
>
> @@ -1632,8 +1711,6 @@ static void rhine_tx(struct net_device *dev)
> struct rhine_private *rp = netdev_priv(dev);
> int txstatus = 0, entry = rp->dirty_tx % TX_RING_SIZE;
>
> - spin_lock(&rp->lock);
> -
> /* find and cleanup dirty tx descriptors */
> while (rp->dirty_tx != rp->cur_tx) {
> txstatus = le32_to_cpu(rp->tx_ring[entry].tx_status);
> @@ -1687,8 +1764,6 @@ static void rhine_tx(struct net_device *dev)
> }
> if ((rp->cur_tx - rp->dirty_tx) < TX_QUEUE_LEN - 4)
> netif_wake_queue(dev);
> -
> - spin_unlock(&rp->lock);
> }
>
> /**
> @@ -1839,20 +1914,8 @@ static int rhine_rx(struct net_device *dev, int limit)
> return count;
> }
>
> -/*
> - * Clears the "tally counters" for CRC errors and missed frames(?).
> - * It has been reported that some chips need a write of 0 to clear
> - * these, for others the counters are set to 1 when written to and
> - * instead cleared when read. So we clear them both ways ...
> - */
> -static inline void clear_tally_counters(void __iomem *ioaddr)
> +static void rhine_restart_tx(struct net_device *dev)
> {
> - iowrite32(0, ioaddr + RxMissed);
> - ioread16(ioaddr + RxCRCErrs);
> - ioread16(ioaddr + RxMissed);
> -}
> -
> -static void rhine_restart_tx(struct net_device *dev) {
> struct rhine_private *rp = netdev_priv(dev);
> void __iomem *ioaddr = rp->base;
> int entry = rp->dirty_tx % TX_RING_SIZE;
> @@ -1880,8 +1943,7 @@ static void rhine_restart_tx(struct net_device *dev) {
> iowrite8(ioread8(ioaddr + ChipCmd1) | Cmd1TxDemand,
> ioaddr + ChipCmd1);
> IOSYNC;
> - }
> - else {
> + } else {
> /* This should never happen */
> if (debug > 1)
> netdev_warn(dev, "%s() Another error occurred %08x\n",
> @@ -1890,72 +1952,46 @@ static void rhine_restart_tx(struct net_device *dev) {
>
> }
>
> -static void rhine_error(struct net_device *dev, int intr_status)
> +static void rhine_slow_event_task(struct work_struct *work)
> {
> - struct rhine_private *rp = netdev_priv(dev);
> + struct rhine_private *rp =
> + container_of(work, struct rhine_private, slow_event_task);
> + struct net_device *dev = rp->dev;
> void __iomem *ioaddr = rp->base;
> + u32 intr_status;
>
> - spin_lock(&rp->lock);
> + if (!netif_running(dev))
> + return;
> +
> + mutex_lock(&rp->task_lock);
> +
> + intr_status = get_intr_status(dev);
> + rhine_ack_event(rp, intr_status & RHINE_EVENT_SLOW);
>
> if (intr_status & IntrLinkChange)
> rhine_check_media(dev, 0);
> - if (intr_status & IntrStatsMax) {
> - dev->stats.rx_crc_errors += ioread16(ioaddr + RxCRCErrs);
> - dev->stats.rx_missed_errors += ioread16(ioaddr + RxMissed);
> - clear_tally_counters(ioaddr);
> - }
> - if (intr_status & IntrTxAborted) {
> - if (debug > 1)
> - netdev_info(dev, "Abort %08x, frame dropped\n",
> - intr_status);
> - }
> - if (intr_status & IntrTxUnderrun) {
> - if (rp->tx_thresh < 0xE0)
> - BYTE_REG_BITS_SET((rp->tx_thresh += 0x20), 0x80, ioaddr + TxConfig);
> - if (debug > 1)
> - netdev_info(dev, "Transmitter underrun, Tx threshold now %02x\n",
> - rp->tx_thresh);
> - }
> - if (intr_status & IntrTxDescRace) {
> - if (debug > 2)
> - netdev_info(dev, "Tx descriptor write-back race\n");
> - }
> - if ((intr_status & IntrTxError) &&
> - (intr_status & (IntrTxAborted |
> - IntrTxUnderrun | IntrTxDescRace)) == 0) {
> - if (rp->tx_thresh < 0xE0) {
> - BYTE_REG_BITS_SET((rp->tx_thresh += 0x20), 0x80, ioaddr + TxConfig);
> - }
> - if (debug > 1)
> - netdev_info(dev, "Unspecified error. Tx threshold now %02x\n",
> - rp->tx_thresh);
> - }
> - if (intr_status & (IntrTxAborted | IntrTxUnderrun | IntrTxDescRace |
> - IntrTxError))
> - rhine_restart_tx(dev);
>
> - if (intr_status & ~(IntrLinkChange | IntrStatsMax | IntrTxUnderrun |
> - IntrTxError | IntrTxAborted | IntrNormalSummary |
> - IntrTxDescRace)) {
> - if (debug > 1)
> - netdev_err(dev, "Something Wicked happened! %08x\n",
> - intr_status);
> - }
> + /* FIXME: ignore ? */
> + if (intr_status & IntrPCIErr)
> + netif_warn(rp, hw, dev, "PCI error\n");
>
> - spin_unlock(&rp->lock);
> + napi_disable(&rp->napi);
> + iowrite16(0x0000, ioaddr + IntrEnable);
> + mmiowb();
> + /* Slow and safe. Consider __napi_schedule as a replacement ? */
> + napi_enable(&rp->napi);
> + napi_schedule(&rp->napi);
> +
> + mutex_unlock(&rp->task_lock);
> }
>
> static struct net_device_stats *rhine_get_stats(struct net_device *dev)
> {
> struct rhine_private *rp = netdev_priv(dev);
> - void __iomem *ioaddr = rp->base;
> - unsigned long flags;
>
> - spin_lock_irqsave(&rp->lock, flags);
> - dev->stats.rx_crc_errors += ioread16(ioaddr + RxCRCErrs);
> - dev->stats.rx_missed_errors += ioread16(ioaddr + RxMissed);
> - clear_tally_counters(ioaddr);
> - spin_unlock_irqrestore(&rp->lock, flags);
> + spin_lock_bh(&rp->lock);
> + rhine_update_rx_crc_and_missed_errord(rp);
> + spin_unlock_bh(&rp->lock);
>
> return &dev->stats;
> }
> @@ -2022,9 +2058,9 @@ static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
> struct rhine_private *rp = netdev_priv(dev);
> int rc;
>
> - spin_lock_irq(&rp->lock);
> + mutex_lock(&rp->task_lock);
> rc = mii_ethtool_gset(&rp->mii_if, cmd);
> - spin_unlock_irq(&rp->lock);
> + mutex_unlock(&rp->task_lock);
>
> return rc;
> }
> @@ -2034,10 +2070,10 @@ static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
> struct rhine_private *rp = netdev_priv(dev);
> int rc;
>
> - spin_lock_irq(&rp->lock);
> + mutex_lock(&rp->task_lock);
> rc = mii_ethtool_sset(&rp->mii_if, cmd);
> - spin_unlock_irq(&rp->lock);
> rhine_set_carrier(&rp->mii_if);
> + mutex_unlock(&rp->task_lock);
>
> return rc;
> }
> @@ -2073,6 +2109,7 @@ static void rhine_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
> if (!(rp->quirks & rqWOL))
> return;
>
> + /* FIXME: huh ? */
> spin_lock_irq(&rp->lock);
> wol->supported = WAKE_PHY | WAKE_MAGIC |
> WAKE_UCAST | WAKE_MCAST | WAKE_BCAST; /* Untested */
> @@ -2092,6 +2129,7 @@ static int rhine_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
> if (wol->wolopts & ~support)
> return -EINVAL;
>
> + /* FIXME: huh (sic) ? */
> spin_lock_irq(&rp->lock);
> rp->wolopts = wol->wolopts;
> spin_unlock_irq(&rp->lock);
> @@ -2119,10 +2157,10 @@ static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> if (!netif_running(dev))
> return -EINVAL;
>
> - spin_lock_irq(&rp->lock);
> + mutex_lock(&rp->task_lock);
> rc = generic_mii_ioctl(&rp->mii_if, if_mii(rq), cmd, NULL);
> - spin_unlock_irq(&rp->lock);
> rhine_set_carrier(&rp->mii_if);
> + mutex_unlock(&rp->task_lock);
>
> return rc;
> }
> @@ -2133,11 +2171,10 @@ static int rhine_close(struct net_device *dev)
> void __iomem *ioaddr = rp->base;
>
> napi_disable(&rp->napi);
> + cancel_work_sync(&rp->slow_event_task);
> cancel_work_sync(&rp->reset_task);
> netif_stop_queue(dev);
>
> - spin_lock_irq(&rp->lock);
> -
> if (debug > 1)
> netdev_dbg(dev, "Shutting down ethercard, status was %04x\n",
> ioread16(ioaddr + ChipCmd));
> @@ -2151,8 +2188,6 @@ static int rhine_close(struct net_device *dev)
> /* Stop the chip's Tx and Rx processes. */
> iowrite16(CmdStop, ioaddr + ChipCmd);
>
> - spin_unlock_irq(&rp->lock);
> -
> free_irq(rp->pdev->irq, dev);
> free_rbufs(dev);
> free_tbufs(dev);
> @@ -2239,10 +2274,12 @@ static int rhine_suspend(struct pci_dev *pdev, pm_message_t state)
> netif_device_detach(dev);
> pci_save_state(pdev);
>
> + /* FIXME: ? */
> spin_lock_irqsave(&rp->lock, flags);
> rhine_shutdown(pdev);
> spin_unlock_irqrestore(&rp->lock, flags);
>
> + /* FIXME: nuclear workaround ? Check the commit log. */
> free_irq(dev->irq, dev);
> return 0;
> }
> @@ -2257,6 +2294,7 @@ static int rhine_resume(struct pci_dev *pdev)
> if (!netif_running(dev))
> return 0;
>
> + /* FIXME: see above. */
> if (request_irq(dev->irq, rhine_interrupt, IRQF_SHARED, dev->name, dev))
> netdev_err(dev, "request_irq failed\n");
>
>
> --
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