From ee0c6bfbd602cdad2ab1780061b3b1a9108cbd6c Mon Sep 17 00:00:00 2001 From: Dan Carpenter <error27@gmail.com> Date: Wed, 23 Jun 2010 13:19:55 +0200 Subject: [PATCH] drm/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@gmail.com> Reported-by: Benny Halevy <bhalevy@panasas.com> Tested-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Eric Anholt <eric@anholt.net> --- drivers/gpu/drm/i915/i915_dma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 4d59710c717e1..19677ecfe2bf8 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)) -- GitLab