i915, fix oops after killing X

Null sarea_priv, because next lastclose would have bad address in it if
initialization is not called in the meantime.

This is a problem in setups, where drm are closed after X starts. Next
lastclose is invoked on X kill. Newer intel drivers (2.2) with EXA support
hold the device whole time while X runs.

Signed-off-by: Jiri Slaby
Cc: Dave Airlie

---
commit c50f4766654ec13d8dc35f96a8d2c199d6ae5c91
tree 3e3a65f44bedf6d846cbb43a315d2f0bce8b7da2
parent f2e573d8a1b391584c76e95f287010b38867de64
author Jiri Slaby Sun, 16 Dec 2007 19:24:13 +0100
committer Jiri Slaby Sun, 16 Dec 2007 19:24:13 +0100

drivers/char/drm/i915_dma.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/char/drm/i915_dma.c b/drivers/char/drm/i915_dma.c
index b274554..7a97eea 100644
--- a/drivers/char/drm/i915_dma.c
+++ b/drivers/char/drm/i915_dma.c
@@ -1335,6 +1335,12 @@ void i915_driver_lastclose(struct drm_device * dev)
i915_mem_takedown(&(dev_priv->agp_heap));

i915_dma_cleanup(dev);
+
+ /* Mapping won't survive to the next firstopen anyways. It will
+ * probably oops without it on next lastclose if we not null it
+ * here, if it will be mapped anywhere else, but without dma being
+ * initialized -js */
+ dev_priv->sarea_priv = NULL;
}

void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
--
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