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net/via-rhine: Fix scheduling while atomic bugs 

There are BUGs "scheduling while atomic" triggered by the timer
rhine_tx_timeout(). They are caused by calling napi_disable() (with
msleep()). This patch fixes it by moving most of the timer content to
the workqueue function (similarly to other drivers, like tg3), with
spin_lock() changed to BH version.

Additionally, there is spin_lock_irq() moved in rhine_close() to
exclude napi_disable() etc., also tg3's way.

Reported-by: Andrey Rahmatullin <wrar@altlinux.org>
Tested-by: Andrey Rahmatullin <wrar@altlinux.org>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2009-12-23 21:54:29 -08:00 committed by David S. Miller
parent 656ab8172a
commit c0d7a0212b
1 changed files with 28 additions and 13 deletions
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41
drivers/net/via-rhine.c
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@ -102,6 +102,7 @@ static const int multicast_filter_limit = 32;
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/bitops.h>
#include <linux/workqueue.h>
#include <asm/processor.h> /* Processor type for cache alignment. */
#include <asm/io.h>
#include <asm/irq.h>
@ -389,6 +390,7 @@ struct rhine_private {
struct net_device *dev;
struct napi_struct napi;
spinlock_t lock;
struct work_struct reset_task;
/* Frequently used values: keep some adjacent for cache effect. */
u32 quirks;
@ -407,6 +409,7 @@ struct rhine_private {
static int mdio_read(struct net_device *dev, int phy_id, int location);
static void mdio_write(struct net_device *dev, int phy_id, int location, int value);
static int rhine_open(struct net_device *dev);
static void rhine_reset_task(struct work_struct *work);
static void rhine_tx_timeout(struct net_device *dev);
static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
struct net_device *dev);
@ -775,6 +778,8 @@ static int __devinit rhine_init_one(struct pci_dev *pdev,
dev->irq = pdev->irq;
spin_lock_init(&rp->lock);
INIT_WORK(&rp->reset_task, rhine_reset_task);
rp->mii_if.dev = dev;
rp->mii_if.mdio_read = mdio_read;
rp->mii_if.mdio_write = mdio_write;
@ -1179,22 +1184,18 @@ static int rhine_open(struct net_device *dev)
return 0;
}
static void rhine_tx_timeout(struct net_device *dev)
static void rhine_reset_task(struct work_struct *work)
{
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
printk(KERN_WARNING "%s: Transmit timed out, status %4.4x, PHY status "
"%4.4x, resetting...\n",
dev->name, ioread16(ioaddr + IntrStatus),
mdio_read(dev, rp->mii_if.phy_id, MII_BMSR));
struct rhine_private *rp = container_of(work, struct rhine_private,
reset_task);
struct net_device *dev = rp->dev;
/* protect against concurrent rx interrupts */
disable_irq(rp->pdev->irq);
napi_disable(&rp->napi);
spin_lock(&rp->lock);
spin_lock_bh(&rp->lock);
/* clear all descriptors */
free_tbufs(dev);
@ -1206,7 +1207,7 @@ static void rhine_tx_timeout(struct net_device *dev)
rhine_chip_reset(dev);
init_registers(dev);
spin_unlock(&rp->lock);
spin_unlock_bh(&rp->lock);
enable_irq(rp->pdev->irq);
dev->trans_start = jiffies;
@ -1214,6 +1215,19 @@ static void rhine_tx_timeout(struct net_device *dev)
netif_wake_queue(dev);
}
static void rhine_tx_timeout(struct net_device *dev)
{
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
printk(KERN_WARNING "%s: Transmit timed out, status %4.4x, PHY status "
"%4.4x, resetting...\n",
dev->name, ioread16(ioaddr + IntrStatus),
mdio_read(dev, rp->mii_if.phy_id, MII_BMSR));
schedule_work(&rp->reset_task);
}
static netdev_tx_t rhine_start_tx(struct sk_buff *skb,
struct net_device *dev)
{
@ -1830,10 +1844,11 @@ static int rhine_close(struct net_device *dev)
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
spin_lock_irq(&rp->lock);
netif_stop_queue(dev);
napi_disable(&rp->napi);
cancel_work_sync(&rp->reset_task);
netif_stop_queue(dev);
spin_lock_irq(&rp->lock);
if (debug > 1)
printk(KERN_DEBUG "%s: Shutting down ethercard, "