On Tue, Mar 19, 2019 at 11:48 PM Peter Hutterer <peter.hutterer@xxxxxxxxx> wrote: > > hidpp_scroll_counter_handle_scroll() doesn't expect a 0-value scroll event, it > gets interpreted as a negative scroll direction event. This can cause scroll > direction resets and thus broken scrolling. > > Reported-and-tested-by: Aimo Metsälä <aimetsal@xxxxxxxxxxx> > Signed-off-by: Peter Hutterer <peter.hutterer@xxxxxxxxx> > --- Added the 'Fixes' and "cc: stable" tags and patch applied to for-5.1/upstream-fixes Cheers, Benjamin > drivers/hid/hid-logitech-hidpp.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c > index 15ed6177a7a3..f040c8a7f9a9 100644 > --- a/drivers/hid/hid-logitech-hidpp.c > +++ b/drivers/hid/hid-logitech-hidpp.c > @@ -2608,8 +2608,9 @@ static int m560_raw_event(struct hid_device *hdev, u8 *data, int size) > input_report_rel(mydata->input, REL_Y, v); > > v = hid_snto32(data[6], 8); > - hidpp_scroll_counter_handle_scroll( > - &hidpp->vertical_wheel_counter, v); > + if (v != 0) > + hidpp_scroll_counter_handle_scroll( > + &hidpp->vertical_wheel_counter, v); > > input_sync(mydata->input); > } > -- > 2.20.1 >
