From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Sat, 21 Apr 2012 05:33:08 +0000 (-0700)
Subject: Input: serio_raw - ensure we don't block in non-blocking read
X-Git-Tag: v3.5-rc1~103^2^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=486c8aba39e5f194519cd5c0e85e5d1de8b74b03;p=pandora-kernel.git

Input: serio_raw - ensure we don't block in non-blocking read

Avoid calling wait_event_interruptible() if client requested non-blocking
read, since it is not guaranteed that another thread will not consume
event after we checked if serio_raw->head != serio_raw->tail.

Also ensure we do not return 0 but keep waiting instead in blocking case,
when another thread steals "our" byte.

Reviewed-by: David Herrmann <dh.herrmann@googlemail.com>
Reviewed-by: Che-Liang Chiou <clchiou@chromium.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

Reading git-diff-tree failed