From: Jarek Poplawski <redacted>
Date: Fri, 1 Aug 2008 07:01:50 +0000

On Fri, Aug 01, 2008 at 06:48:10AM +0000, Jarek Poplawski wrote:

quoted

On Thu, Jul 31, 2008 at 05:29:32AM -0700, David Miller wrote:

...

quoted

quoted

diff --git a/net/core/dev.c b/net/core/dev.c
index 63d6bcd..69320a5 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c

@@ -4200,6 +4200,7 @@ static void netdev_init_queues(struct net_device *dev)
 {
 	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
 	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
+	spin_lock_init(&dev->tx_global_lock);

This will probably need some lockdep annotations similar to
_xmit_lock.

...BTW, we probably could also consider some optimization here: the
xmit_lock of the first queue could be treated as special, and only
the owner could do such a freezing. This would save changes of
functionality to non mq devices. On the other hand, it would need
remembering about this special treatment (so, eg. a separate lockdep
initialization than all the others).

I think special casing the zero's queue's lock is a bad idea.
Having a real top-level synchronizer is a powerful tool and
we could use it for other things.
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