[Bug 219683] Noname webcam used to work, but not anymore.

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219683

--- Comment #3 from Pierre Juhen (pierre.juhen@orange.fr) ---
So the problem lies here in uvc_driver.

struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
{
        struct uvc_entity *entity;

        list_for_each_entry(entity, &dev->entities, list) {
                if (entity->id == id)
                        return entity;
        }

        return NULL;
}


The UVC spec says :

Each Unit and Terminal WITHIN THE VIDEO FUNCTION function is assigned a unique
identification number, the
Unit ID (UID) or Terminal ID (TID), contained in the bUnitID or bTerminalID
field of the
descriptor, but the control includes also sound function, that explains why the
issue occurs.

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