tree 41b3c2b291b96218d92c8a8d321b7400b0a01006
parent 36a281e25276f2d138bbbca4170d11453323cce1
author Dima Zavin <dima@android.com> 1325287004 -0800
committer Dmitry Torokhov <dmitry.torokhov@gmail.com> 1325287594 -0800

Input: evdev - only allow reading events if a full packet is present

Without this, it was possible for the reader to get ahead of packet_head.
If the input device generated a partial packet *right* after the reader
got ahead, then we can get into a situation where the device is marked
readable, but read always returns 0 until the next packet is finished
(i.e a SYN is generated by the input driver).

This situation can also happen if we overflow the buffer while a reader
is trying to read an event out.

Signed-off-by: Dima Zavin <dima@android.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>