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94dadc1d14
(EV_MSC, MSC_TIMESTAMP) is added to each frame just before the SYN event since kernel 4.15. EV_MSC is configured as INPUT_PASS_TO_ALL. In the use case of virtio-input, there is a loop as follows: - A mt frame with (EV_MSC, MSC_TIMESTAMP) is passed to FE. - FE will call virtinput_status to pass (EV_MSC, MSC_TIMESTAMP) back to BE. - BE writes this event to evdev. Because (EV_MSC, MSC_TIMESTAMP) is configured as INPUT_PASS_TO_ALL, it will be written into the event buffer of evdev then be read out by BE without SYN followed. - Each mt frame will introduce one (EV_MSC, MSC_TIMESTAMP). Later the frame becomes larger and larger... This patch fixed above issue by ignoring MSC_TIMESTAMP from guest. Besides that timestamp is added for every status event from guest before writing to evdev. Tracked-On: #1670 Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com>