From 5b51694aff705c465ef5941a99073036f3e444d9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=3D=3Futf-8=3Fq=3FMichel=5FD=3DC3=3DA4nzer=3F=3D?=
 <michel@tungstengraphics.com>
Date: Wed, 25 Oct 2006 00:08:23 +1000
Subject: [PATCH] drm: Make handling of dev_priv->vblank_pipe more robust.

Initialize it to default value if it hasn't been set by the X server yet.

In i915_vblank_pipe_set(), only update dev_priv->vblank_pipe and call
i915_enable_interrupt() if the argument passed from userspace is valid to avoid
corrupting dev_priv->vblank_pipe on invalid arguments.

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