netdev - Re: [PATCHv1 net] xen-netback: transition to CLOSED when removing a VIF

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Message-ID: <5252BDD1.1000301@citrix.com>
Date:	Mon, 7 Oct 2013 14:57:37 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	<xen-devel@...ts.xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<netdev@...r.kernel.org>, Ian Campbell <ian.campbell@...rix.com>,
	Paul Durrant <Paul.Durrant@...rix.com>
Subject: Re: [PATCHv1 net] xen-netback: transition to CLOSED when removing
 a VIF

On 07/10/13 14:43, Wei Liu wrote:
> On Mon, Oct 07, 2013 at 01:55:19PM +0100, David Vrabel wrote:
>> From: David Vrabel <david.vrabel@...rix.com>
>>
>> If a guest is destroyed without transitioning its frontend to CLOSED,
>> the domain becomes a zombie as netback was not grant unmapping the
>> shared rings.
>>
>> When removing a VIF, transition the backend to CLOSED so the VIF is
>> disconnected if necessary (which will unmap the shared rings etc).
>>
>> This fixes a regression introduced by
>> 279f438e36c0a70b23b86d2090aeec50155034a9 (xen-netback: Don't destroy
>> the netdev until the vif is shut down).
>>
> 
> Is this regression solely caused by 279f438e36c or caused by both
> ea732dff5c and 279f438e36c? I ask because you make use of the new state
> machine introduced in ea732dff5c. Or are you simply using the new state
> machine to fix the regression instead of going back to old code?

I bisected it to 279f438.  I'm just using the handy new state machine to
fix it.

David
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