Re: [Xen-devel] [PATCHv1 net] xen-netback: release pending index before pushing Tx responses

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Feb 24, 2015 at 11:17:59AM +0000, David Vrabel wrote:
> If the pending indexes are released /after/ pushing the Tx response
> then a stale pending index may be used if a new Tx request is
> immediately pushed by the frontend.  The may cause various WARNINGs or
> BUGs if the stale pending index is actually still in use.
> 
> Fix this by releasing the pending index before pushing the Tx
> response.
> 
> The full barrier for the pending ring update is not required since the
> the Tx response push already has a suitable write barrier.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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