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drm/cirrus: 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). Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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1 changed files with 4 additions and 11 deletions
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@ -293,25 +293,18 @@ cirrus_dumb_mmap_offset(struct drm_file *file,
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uint64_t *offset)
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{
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struct drm_gem_object *obj;
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int ret;
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struct cirrus_bo *bo;
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mutex_lock(&dev->struct_mutex);
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obj = drm_gem_object_lookup(dev, file, handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto out_unlock;
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}
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if (obj == NULL)
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return -ENOENT;
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bo = gem_to_cirrus_bo(obj);
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*offset = cirrus_bo_mmap_offset(bo);
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drm_gem_object_unreference(obj);
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ret = 0;
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out_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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bool cirrus_check_framebuffer(struct cirrus_device *cdev, int width, int height,
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