Hi,
We sometimes receive a "Bus master arbitration failure, status ffff"
error on pcnet32 drivers while running a huge network load on a 2.6.x
kernel. Applying spinlocks on the watchdog timer routine helps getting
across the problem. A patch for the same is given below.
This patch has been created on 2.6.2-rc1 and tested on an SMP system on
IA32 platform.
Please cc me.
-------------------------------8<--------------------------------------
--- pcnet32-orig.c 2004-01-28 10:43:04.000000000 +0530
+++ pcnet32.c 2004-01-28 10:45:00.000000000 +0530
@@ -1695,12 +1695,14 @@
static void pcnet32_watchdog(struct net_device *dev)
{
struct pcnet32_private *lp = dev->priv;
-
+ unsigned long flags;
+ spin_lock_irqsave(&lp->lock, flags);
/* Print the link status if it has changed */
if (lp->mii)
mii_check_media (&lp->mii_if, 1, 0);
mod_timer (&(lp->watchdog_timer), PCNET32_WATCHDOG_TIMEOUT);
+ spin_unlock_irqrestore(&lp->lock, flags);
}
static struct pci_driver pcnet32_driver = {
---------------------------------8<--------------------------------------
Regards,
Chinmay Albal
Linux Technology Centre,
IBM Software Labs, Bangalore,
mail - albal@in.ibm.com
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