From f816f272437f3a2be0c9254d4ab8f917950d86a0 Mon Sep 17 00:00:00 2001
From: Rob Clark <robdclark@gmail.com>
Date: Wed, 11 Sep 2013 17:34:07 -0400
Subject: [PATCH] drm/msm: return -EBUSY if bo still active

When we CPU_PREP a bo with NOSYNC flag (for example, to implement
PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE), an -EBUSY return indicates to
userspace that the bo is still busy.  Previously it was incorrectly
returning 0 in this case.

And while we're in there throw in an bit of extra sanity checking in
case userspace tries to wait for a bogus fence.

Signed-off-by: Rob Clark <robdclark@gmail.com>
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