From ecbec53b1d00ba582f71b210ed96cafc05ebd189 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@google.com>
Date: Mon, 27 Jun 2011 16:18:20 -0700
Subject: drm/i915: more struct_mutex locking

When auditing the locking in i915_gem.c (for a prospective change which
I then abandoned), I noticed two places where struct_mutex is not held
across GEM object manipulations that would usually require it.

Since one is in initial setup and the other in driver unload, I'm
guessing the mutex is not required for either; but post a patch in case
it is.

Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Keith Packard <keithp@keithp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/gpu/drm/i915/intel_overlay.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'drivers/gpu/drm/i915/intel_overlay.c')

diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index a670c006982e..56a8e2aea19c 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -1416,6 +1416,8 @@ void intel_setup_overlay(struct drm_device *dev)
 		goto out_free;
 	overlay->reg_bo = reg_bo;
 
+	mutex_lock(&dev->struct_mutex);
+
 	if (OVERLAY_NEEDS_PHYSICAL(dev)) {
 		ret = i915_gem_attach_phys_object(dev, reg_bo,
 						  I915_GEM_PHYS_OVERLAY_REGS,
@@ -1440,6 +1442,8 @@ void intel_setup_overlay(struct drm_device *dev)
                 }
 	}
 
+	mutex_unlock(&dev->struct_mutex);
+
 	/* init all values */
 	overlay->color_key = 0x0101fe;
 	overlay->brightness = -19;
@@ -1464,6 +1468,7 @@ out_unpin_bo:
 	i915_gem_object_unpin(reg_bo);
 out_free_bo:
 	drm_gem_object_unreference(&reg_bo->base);
+	mutex_unlock(&dev->struct_mutex);
 out_free:
 	kfree(overlay);
 	return;
-- 
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