tree 613f1456fe437419bbc014f84d7d3c2e73568743
parent dba4258068f822b7dafc78c28fe9c99c551eca7e
author Dmitry Torokhov <dmitry.torokhov@gmail.com> 1335942817 -0700
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> 1335943438 -0700

Input: evdev - properly handle read/write with count 0

According to the standard count 0 is special - no IO should happen but we
can check error conditions (device gone away, etc), and return 0 if there
are no errors. We used to return -EINVAL instead and we also could return 0
if an event was "stolen" by another thread.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>