• Jason Gerecke's avatar
    HID: wacom: Fix poor prox handling in 'wacom_pl_irq' · 282e4637
    Jason Gerecke authored
    Commit 025bcc15 performed cleanup work on the 'wacom_pl_irq' function, making
    it follow the standards used in the rest of the codebase. The change
    unintiontionally allowed the function to send input events from reports
    that are not marked as being in prox. This can cause problems as the
    report values for X, Y, etc. are not guaranteed to be correct. In
    particular, occasionally the tablet will send a report with these values
    set to zero. If such a report is received it can caus an unexpected jump
    in the XY position.
    
    This patch surrounds more of the processing code with a proximity check,
    preventing these zeroed reports from overwriting the current state. To
    be safe, only the tool type and ABS_MISC events should be reported when
    the pen is marked as being out of prox.
    
    Fixes: 025bcc15 ("HID: wacom: Simplify 'wacom_pl_irq'")
    Signed-off-by: default avatarJason Gerecke <jason.gerecke@wacom.com>
    Reviewed-by: default avatarPing Cheng <pingc@wacom.com>
    Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
    282e4637
wacom_wac.c 129 KB