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>
diff --git a/drivers/net/tc35815.c b/drivers/net/tc35815.c
index 876f45a..49bd84c 100644
--- a/drivers/net/tc35815.c
+++ b/drivers/net/tc35815.c
@@ -402,6 +402,7 @@
* 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 @@
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 @@
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 @@
/* 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 @@
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 @@
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 @@
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 @@
}
status = tc_readl(&tr->Int_Src);
} while (status);
- spin_unlock(&lp->lock);
+ spin_unlock(&lp->rx_lock);
if (received < budget) {
napi_complete(napi);