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| author |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-08-08 09:10:37 +0200 |
|---|---|---|
| committer |   Dave Airlie <airlied@gmail.com> | 2013-08-19 13:24:54 +1000 |
| commit | eb91626ac4b9af3d5602a7db888b8bc4cb23eb3b (patch) | |
| tree | b7edc496796b7789b912944ef3f766a20f1a6e4a /drivers/gpu | |
| parent | Merge branch 'drm-fixes-3.11' of git://people.freedesktop.org/~agd5f/linux (diff) | |
| download | linux-dev-eb91626ac4b9af3d5602a7db888b8bc4cb23eb3b.tar.xz linux-dev-eb91626ac4b9af3d5602a7db888b8bc4cb23eb3b.zip | |
drm/i915: unpin backing storage in dmabuf_unmap
This fixes a WARN in i915_gem_free_object when the
obj->pages_pin_count isn't 0.
v2: Add locking to unmap, noticed by Chris Wilson. Note that even
though we call unmap with our own dev->struct_mutex held that won't
result in an immediate deadlock since we never go through the dma_buf
interfaces for our own, reimported buffers. But it's still easy to
blow up and anger lockdep, but that's already the case with our ->map
implementation. Fixing this for real will involve per dma-buf ww mutex
locking by the callers. And lots of fun. So go with the duct-tape
approach for now.
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reported-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Tested-by: Armin K. <krejzi@email.com> (v1)
Tested-by: Dave Airlie <airlied@redhat.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_dmabuf.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index dc53a527126b..9e6578330801 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -85,9 +85,17 @@ static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *sg, enum dma_data_direction dir) { + struct drm_i915_gem_object *obj = attachment->dmabuf->priv; + + mutex_lock(&obj->base.dev->struct_mutex); + dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); sg_free_table(sg); kfree(sg); + + i915_gem_object_unpin_pages(obj); + + mutex_unlock(&obj->base.dev->struct_mutex); } static void i915_gem_dmabuf_release(struct dma_buf *dma_buf) |