From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed, 27 Mar 2013 23:03:25 +0000 (+0100)
Subject: drm/i915: fix up _wait_for macro
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~55^2~51^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d5bfac96f1e1856fbdb3f06679691e5b9c2ba8f;p=pandora-kernel.git

drm/i915: fix up _wait_for macro

As Thomas Gleixner spotted, it's rather horrible racy:
- We can miss almost a full tick, so need to compensate by 1 jiffy.
- We need to re-check the condition when having timed-out, since a
  the last check could have been before the timeout expired. E.g. when
  we've been preempted or a long irq happened.

Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Jack Winter <jbh@alchemy.lu>
Cc: Jack Winter <jbh@alchemy.lu>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

Reading git-diff-tree failed