netdev - Re: [PATCH] virtio_net/virtio_ring: fix race in enable

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Message-Id: <200803170730.44218.borntraeger@de.ibm.com>
Date:	Mon, 17 Mar 2008 07:30:44 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] virtio_net/virtio_ring: fix race in enable_cb

> Are you seeing the "Unlikely: restart svq failed" message in the logs?  If 
> not, I don't think it can be this race.

No, I dont see the message, but this message only happens for guest->host 
traffic in the xmit function. I was fixing the poll function - which has no 
printk.
I added the disable_cb in the xmit function only  to adopt to changed 
enable_cb semantics.

I double checked my theory with a printk in enable_cb. The more_used check 
was true several times for the receiving virtqueue. 

Christian
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