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SubjectRe: [PATCH V2] virtio_input: Prevent EV_MSC/MSC_TIMESTAMP loop storm for MT.
  Hi,

> + /*
> + * Since 29cc309d8bf1 (HID: hid-multitouch: forward MSC_TIMESTAMP),
> + * EV_MSC/MSC_TIMESTAMP is added to each before EV_SYN event.
> + * EV_MSC is configured as INPUT_PASS_TO_ALL.
> + * In case of touch device:
> + * BE pass EV_MSC/MSC_TIMESTAMP to FE on receiving event from evdev.
> + * FE pass EV_MSC/MSC_TIMESTAMP back to BE.
> + * BE writes EV_MSC/MSC_TIMESTAMP to evdev due to INPUT_PASS_TO_ALL.
> + * BE receives extra EV_MSC/MSC_TIMESTAMP and pass to FE.
> + * >>> Each new frame becomes larger and larger.
> + * Disable EV_MSC/MSC_TIMESTAMP forwarding for MT.
> + */
> + if (vi->idev->mt && type == EV_MSC && code == MSC_TIMESTAMP)
> + return 0;
> +

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>

take care,
Gerd

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