Re: [PATCH v2 2/3] drm: Add a drm_gem_objects_lookup helper

[Eric Anholt]

Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:

> Quoting Daniel Vetter (2019-04-01 14:06:48)
>> On Mon, Apr 1, 2019 at 9:47 AM Rob Herring <robh@xxxxxxxxxx> wrote:
>> > +{
>> > +       int i, ret = 0;
>> > +       struct drm_gem_object *obj;
>> > +
>> > +       spin_lock(&filp->table_lock);
>> > +
>> > +       for (i = 0; i < count; i++) {
>> > +               /* Check if we currently have a reference on the object */
>> > +               obj = idr_find(&filp->object_idr, handle[i]);
>> > +               if (!obj) {
>> > +                       ret = -ENOENT;
>
> Unwind previous drm_gem_object_get(), the caller has no idea how many
> were processed before the error.

I had the same thought, but the pattern we have is that you're loading
into a refcounted struct that will free the BOs when you're done,
anyway.

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