virtio_input: Prevent EV_MSC/MSC_TIMESTAMP loop storm for MT.
In 'commit 29cc309d ("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 a touch device which report MSC_TIMESTAMP: 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. V2: Rebase. Signed-off-by:Colin Xu <colin.xu@intel.com> Link: https://lore.kernel.org/r/20210202001923.6227-1-colin.xu@intel.com Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Reviewed-by:
Gerd Hoffmann <kraxel@redhat.com>
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