linux-kernel - [patch] i915: take struct_mutex in i915_dma

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Message-ID: <20100623111954.GA16433@bicker>
Date:	Wed, 23 Jun 2010 13:19:55 +0200
From:	Dan Carpenter <error27@...il.com>
To:	David Airlie <airlied@...ux.ie>
Cc:	Eric Anholt <eric@...olt.net>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Zhenyu Wang <zhenyuw@...ux.intel.com>, nanhai.zou@...el.com,
	Benny Halevy <bhalevy@...asas.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [patch] i915: take struct_mutex in i915_dma_cleanup()

intel_cleanup_ring_buffer() calls drm_gem_object_unreference() (as
opposed to drm_gem_object_unreference_unlocked()) so it needs to be
called with "struct_mutex" held.  If we don't hold the lock, it triggers
a BUG_ON(!mutex_is_locked(&dev->struct_mutex));

I also audited the other places that call intel_cleanup_ring_buffer()
and they all hold the lock so they're OK.

This was introduced in: 8187a2b70e3 "drm/i915: introduce
intel_ring_buffer structure (V2)" and it's a regression from v2.6.34.

Addresses: https://bugzilla.kernel.org/show_bug.cgi?id=16247

Signed-off-by: Dan Carpenter <error27@...il.com>
Reported-by: Benny Halevy <bhalevy@...asas.com>
Tested-by: Benny Halevy <bhalevy@...asas.com>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 59a2bf8..3325af1 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -128,9 +128,11 @@ static int i915_dma_cleanup(struct drm_device * dev)
 	if (dev->irq_enabled)
 		drm_irq_uninstall(dev);
 
+	mutex_lock(&dev->struct_mutex);
 	intel_cleanup_ring_buffer(dev, &dev_priv->render_ring);
 	if (HAS_BSD(dev))
 		intel_cleanup_ring_buffer(dev, &dev_priv->bsd_ring);
+	mutex_unlock(&dev->struct_mutex);
 
 	/* Clear the HWS virtual address at teardown */
 	if (I915_NEED_GFX_HWS(dev))

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