From cf65f1623dd005ddfb1cbba20af3423a6c638dbe Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@starflyer.(none)>
Date: Thu, 24 Nov 2005 21:41:14 +1100
Subject: [PATCH] drm: fix quiescent locking

A fix for a locking bug which is triggered when a client tries to lock with
flag DMA_QUIESCENT (typically the X server), but gets interrupted by a signal.
The locking IOCTL should then return an error, but if DMA_QUIESCENT succeeds
it returns 0, and the client falsely thinks it has the lock. In addition
The client waits for DMA_QUISCENT and possibly DMA_READY without having the lock.

From: Thomas Hellstrom
Signed-off-by: Dave Airlie <airlied@linux.ie>
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