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| author | Colin Xu <colin.xu@intel.com> | 2021-02-02 01:19:23 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-02-23 13:52:59 +0100 |
| commit | a6829c350ec6bec47752826c9738122308e1588c (patch) | |
| tree | 03a3e48d1f56bc97ea4fed156d17841537a66f6a /net/mpls | |
| parent | virtio-blk: support per-device queue depth (diff) | |
| download | linux-a6829c350ec6bec47752826c9738122308e1588c.tar.xz linux-a6829c350ec6bec47752826c9738122308e1588c.zip | |
virtio_input: Prevent EV_MSC/MSC_TIMESTAMP loop storm for MT.
In 'commit 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 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>
Diffstat (limited to 'net/mpls')
0 files changed, 0 insertions, 0 deletions