drm/rockchip: Don't grab dev->struct_mutex for in mmap offset ioctl
Since David Herrmann's mmap vma manager rework we don't need to grab dev->struct_mutex any more to prevent races when looking up the mmap offset. Drop it and instead don't forget to use the unref_unlocked variant (since the drm core still cares). Aside: I stumbled over the mmap handler which directly does a dma_mmap_attrs. But totally fails to grab a reference on the underlying object and hence looks like it happily just leaks the ptes since there's no guarantee the mmap isn't still around when gem_free_object is called. Which the kerneldoc of dma_mmap_attrs explicitly forbids. v2: Fixup compile fail 0-day spotted. Cc: Mark Yao <mark.yao@rock-chips.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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Родитель
141518b64f
Коммит
648a4ce7ca
drivers/gpu/drm/rockchip
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@ -200,13 +200,10 @@ int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
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struct drm_gem_object *obj;
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int ret;
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mutex_lock(&dev->struct_mutex);
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obj = drm_gem_object_lookup(dev, file_priv, handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object.\n");
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ret = -EINVAL;
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goto unlock;
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return -EINVAL;
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}
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ret = drm_gem_create_mmap_offset(obj);
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@ -217,10 +214,9 @@ int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
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DRM_DEBUG_KMS("offset = 0x%llx\n", *offset);
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out:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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drm_gem_object_unreference_unlocked(obj);
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return 0;
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}
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/*
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