Dmitry Torokhov 2872a9b521 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>

2012-05-02 00:23:58 -07:00

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