[Intel-gfx] [PATCH] drm/i915: unbreak lastclose for failed driver init

[Daniel Vetter]

We now refuse to load on gen6+ if kms is not enabled:

commit 26394d9251879231b85e6c8cf899fa43e75c68f1
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Mar 26 21:33:18 2012 +0200

    drm/i915: refuse to load on gen6+ without kms

Which results in the drm core calling our lastclose function to clean
up the mess, but that one is neatly broken for such failure cases
since kms has been introduced in

commit 79e539453b34e35f39299a899d263b0a1f1670bd
Author: Jesse Barnes <jbarnes at virtuousgeek.org>
Date:   Fri Nov 7 14:24:08 2008 -0800

    DRM: i915: add mode setting support

Reported-by: Paulo Zanoni <przanoni at gmail.com>
Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_dma.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 23868d3..25901c3 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1781,7 +1781,13 @@ void i915_driver_lastclose(struct drm_device * dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 
-	if (!dev_priv || drm_core_check_feature(dev, DRIVER_MODESET)) {
+	/* On gen6+ we refuse to init without kms enabled, but then the drm core
+	 * goes right around and calls lastclose. Check for this and don't clean
+	 * up anything. */
+	if (!dev_priv)
+		return;
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		intel_fb_restore_mode(dev);
 		vga_switcheroo_process_delayed_switch();
 		return;
-- 
1.7.10.4