How to hook into the quick edit action?

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There are two flaws in the code that I can see. The first one is a bug in this code

if($post->post_type != 'product')

If no post exists, you get the following error

Notice: Trying to get property of non-object…

This can be fixed by first checking if a post isset

if(isset($post) && $post->post_type != 'product')

Secondly, wp_set_post_terms() should not be used for custom taxonomies on custom post types, the correct function should be wp_set_object_terms(). From the codex page

This function will only work on the native post type. For a taxonomy on a custom post type use wp_set_object_terms()

So, your code should look something like this

add_action('save_post', 'assign_parent_terms');

function assign_parent_terms($post_id){
global $post;


if(isset($post) && $post->post_type != 'product')
    return $post_id;

// get all assigned terms   
$terms = wp_get_post_terms($post_id, 'product_cat' );
foreach($terms as $term){
    while($term->parent != 0 && !has_term( $term->parent, 'product_cat', $post )){
        // move upward until we get to 0 level terms
        wp_set_object_terms($post_id, array($term->parent), 'product_cat', true);
        $term = get_term($term->parent, 'product_cat');
    }
  }
}

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