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| author | Dan Carpenter <error27@gmail.com> | 2010-06-23 13:19:55 +0200 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2010-07-01 15:41:37 -0700 |
| commit | ee0c6bfbd602cdad2ab1780061b3b1a9108cbd6c (patch) | |
| tree | 30fb8739a7197b2c499aec88f4585e7ecabcd9d3 /drivers/gpu | |
| parent | 2d1c9752eaa4c0b38f6fb1ab79a6addc146cd64e (diff) | |
| download | linux-ee0c6bfbd602cdad2ab1780061b3b1a9108cbd6c.tar.gz linux-ee0c6bfbd602cdad2ab1780061b3b1a9108cbd6c.tar.bz2 linux-ee0c6bfbd602cdad2ab1780061b3b1a9108cbd6c.zip | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 4d59710c717e..19677ecfe2bf 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)) |