On Tue, Mar 28, 2017 at 6:46 PM, Ladi Prosek <[email protected]> wrote:
> The virtio balloon driver contained a not-so-obvious invariant that
> update_balloon_stats has to update exactly VIRTIO_BALLOON_S_NR counters
> in order to send valid stats to the host. This commit fixes it by having
> update_balloon_stats return the actual number of counters, and its
> callers use it when pushing buffers to the stats virtqueue.
>
> Note that it is still out of spec to change the number of counters
> at run-time. "Driver MUST supply the same subset of statistics in all
> buffers submitted to the statsq."
>
> Suggested-by: Arnd Bergmann <[email protected]>
> Signed-off-by: Ladi Prosek <[email protected]>

>
Acked-by: Arnd Bergmann <[email protected]>
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