diff options
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2010-02-24 09:00:34 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-26 13:08:42 +0300 |
| commit | dee7399c2d9a1d3b0af5d68d7e0dd922e104a2a8 (patch) | |
| tree | 49fe76813eeb051711370d210afea01e15082af6 | |
| parent | 9c5f9c2861909753140ad6a41cdc77cdf20c1dc9 (diff) | |
| download | linux-dee7399c2d9a1d3b0af5d68d7e0dd922e104a2a8.tar.xz | |
tc35815: Fix double locking on NAPI
Isolate spinlock for tx and rx to resolve double-locking.
This is potential bug while this controller does not exist on any
SMP platforms, but lockdep or rt-preempt reveals this bug.
Reported-by: Ralf Roesch <ralf.roesch@rw-gmbh.de>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/tc35815.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c index 876f45afbed4..49bd84c0d583 100644 --- a/drivers/net/tc35815.c +++ b/drivers/net/tc35815.c @@ -402,6 +402,7 @@ struct tc35815_local { * by this lock as well. */ spinlock_t lock; + spinlock_t rx_lock; struct mii_bus *mii_bus; struct phy_device *phy_dev; @@ -835,6 +836,7 @@ static int __devinit tc35815_init_one(struct pci_dev *pdev, INIT_WORK(&lp->restart_work, tc35815_restart_work); spin_lock_init(&lp->lock); + spin_lock_init(&lp->rx_lock); lp->pci_dev = pdev; lp->chiptype = ent->driver_data; @@ -1186,6 +1188,7 @@ static void tc35815_restart(struct net_device *dev) printk(KERN_ERR "%s: BMCR reset failed.\n", dev->name); } + spin_lock_bh(&lp->rx_lock); spin_lock_irq(&lp->lock); tc35815_chip_reset(dev); tc35815_clear_queues(dev); @@ -1193,6 +1196,7 @@ static void tc35815_restart(struct net_device *dev) /* Reconfigure CAM again since tc35815_chip_init() initialize it. */ tc35815_set_multicast_list(dev); spin_unlock_irq(&lp->lock); + spin_unlock_bh(&lp->rx_lock); netif_wake_queue(dev); } @@ -1211,11 +1215,14 @@ static void tc35815_schedule_restart(struct net_device *dev) struct tc35815_local *lp = netdev_priv(dev); struct tc35815_regs __iomem *tr = (struct tc35815_regs __iomem *)dev->base_addr; + unsigned long flags; /* disable interrupts */ + spin_lock_irqsave(&lp->lock, flags); tc_writel(0, &tr->Int_En); tc_writel(tc_readl(&tr->DMA_Ctl) | DMA_IntMask, &tr->DMA_Ctl); schedule_work(&lp->restart_work); + spin_unlock_irqrestore(&lp->lock, flags); } static void tc35815_tx_timeout(struct net_device *dev) @@ -1436,7 +1443,9 @@ static int tc35815_do_interrupt(struct net_device *dev, u32 status, int limit) if (status & Int_IntMacTx) { /* Transmit complete. */ lp->lstats.tx_ints++; + spin_lock_irq(&lp->lock); tc35815_txdone(dev); + spin_unlock_irq(&lp->lock); if (ret < 0) ret = 0; } @@ -1649,7 +1658,7 @@ static int tc35815_poll(struct napi_struct *napi, int budget) int received = 0, handled; u32 status; - spin_lock(&lp->lock); + spin_lock(&lp->rx_lock); status = tc_readl(&tr->Int_Src); do { /* BLEx, FDAEx will be cleared later */ @@ -1667,7 +1676,7 @@ static int tc35815_poll(struct napi_struct *napi, int budget) } status = tc_readl(&tr->Int_Src); } while (status); - spin_unlock(&lp->lock); + spin_unlock(&lp->rx_lock); if (received < budget) { napi_complete(napi); |