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Re: [Xen-devel] [PATCH 2/2] xen-netfront: recreate queues correctly when reconnecting

On Wed, Jun 18, 2014 at 10:47:28AM +0100, David Vrabel wrote:
> When reconnecting to the backend (after a resume/migration, for example),
> a different number of queues may be required (since the guest may have
> moved to a different host with different capabilities).  During the
> reconnection the old queues are torn down and new ones created.
> Introduce xennet_create_queues() and xennet_destroy_queues() that fixes
> three bugs during the reconnection.
> - The old info->queues was leaked.
> - The old queue's napi instances were not deleted.
> - The new queue's napi instances were left disabled (which meant no
>   packets could be received).
> The xennet_destroy_queues() calls is deferred until the reconnection
> instead of the disconnection (in xennet_disconnect_backend()) because
> napi_disable() might sleep.
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

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

> ---
>  drivers/net/xen-netfront.c |  104 
> ++++++++++++++++++++++++++++++--------------
>  1 file changed, 72 insertions(+), 32 deletions(-)

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