tree c484304f9b4298321d0aa82a6a119004fe290eea
parent 6967b4d9de4a7cf3b00cd9a93981d3206d75a1d8
author Henrik Rydberg <rydberg@euromail.se> 1277312966 -0700
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> 1277323527 -0700

Input: evdev - never leave the client buffer empty after write

When the client buffer is very small and wraps around a lot, it may
well be that a write increases the head such that head == tail. If
this happens between the point where a poll is triggered and the
actual data is being read, there will be no data to read. This is
confusing to applications, which might end up closing the file.

This patch solves the problem by making sure the client buffer is
never empty after writing to it.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>