Commit 243cd55e authored by Michael Ellerman's avatar Michael Ellerman Committed by Linus Torvalds

[PATCH] iseries_veth: Supress spurious WARN_ON() at module unload

My patch from a few weeks back (now in mainline), called "Cleanup skbs to
prevent unregister_netdevice() hanging", can cause our TX timeout code to
fire on machines with lots of VLANs (because it takes > 2 seconds between
when we stop the queues and when we're finished stopping the connections).

When that happens the TX timeout code freaks out and does a WARN_ON()
because as far as it's concerned there shouldn't be a TX timeout happening,
which is fair enough.

I have a "proper" fix for this, which is to a) do refcounting on
connections and b) implement a proper ack timer so we don't keep unacked
skbs lying around for ever.  But for 2.6.12 I propose just supressing the
WARN_ON().  Users will still see the "NETDEV WATCHDOG" warning, but that's
not nearly as bad as a WARN_ON() which users interpret as an Oops.
Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7fbdf1a2
......@@ -802,13 +802,14 @@ static void veth_tx_timeout(struct net_device *dev)
spin_lock_irqsave(&port->pending_gate, flags);
if (!port->pending_lpmask) {
spin_unlock_irqrestore(&port->pending_gate, flags);
return;
}
printk(KERN_WARNING "%s: Tx timeout! Resetting lp connections: %08x\n",
dev->name, port->pending_lpmask);
/* If we've timed out the queue must be stopped, which should
* only ever happen when there is a pending packet. */
WARN_ON(! port->pending_lpmask);
for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
struct veth_lpar_connection *cnx = veth_cnx[i];
......
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